The story of asaro — red oil and the steam of yam
The moment you lift the lid, the nutty scent of red palm oil and the green bite of chile mingle in the steam. White yam breaks down little by little, drinking the red broth and turning into a heavy porridge. Asaro (Àsàró) is a yam porridge often spoken of at Yoruba tables in southwestern Nigeria.
In English it is also called Nigerian yam porridge or yam pottage. By name it sounds like a congee, but it is quite different from Japanese rice porridge. The star is white yam, not rice. Big pieces of yam are simmered with chile, tomato, onion, red palm oil, and crayfish powder or smoked fish, then broken down only halfway. It is neither a thin soup nor a full mash; the thickness that leaves a trail when you run a wooden spoon through it is what makes it asaro.
The part that causes hesitation outside Nigeria is the yam. Nigerian white yam is a different thing from sweet potato or potato: less sweet, and when simmered it turns crumbly without getting too sticky. If you can't get imported yam, mixing Chinese yam (nagaimo) with taro gets closer than Chinese yam alone. Chinese yam is light and taro is sticky. Combine the two, and bring in the aroma with red palm oil and crayfish powder, and that is where a home version lands.
If jollof rice is Nigeria's red rice of celebration, asaro is a red pot closer to everyday. Like egusi soup (in Japanese) and abacha (in Japanese), it uses palm oil, the umami of seafood and the drive of chile, but with yam in it, one plate is a meal. The appeal is that one pot makes lunch with no need to cook rice.
What to keep is the aroma of red palm oil, the base of chile and onion, the umami of crayfish powder or smoked fish, and a texture where the yam is not completely mashed. At home you can make it without imported yam. But swap the red palm oil for ordinary vegetable oil and not only the color but the core of the aroma thins out.
Ingredients (serves 4)
This serves 4. It is an amount for eating as a staple, so halve it for a light side dish. If you can get imported yam, use it. If not, mix Chinese yam and taro to bring the texture close.
This recipe uses fish and dried shrimp. If you have a shellfish allergy, do not use the crayfish powder; substitute bonito flake powder or kombu stock. Scotch bonnet is fiercely hot even in small amounts, so the first time start with 1/4 or a little bottled hot sauce and adjust.
The things worth tracking down are the red palm oil that sets the aroma of asaro, the dried shrimp powder that stands in for crayfish powder, and the Scotch bonnet-style heat that adds chile aroma. The long yam, taro, onion, tomato and greens are easy to find in an ordinary grocery store. Hunting for imported yam first tends to stall shopping, so it succeeds better the first time to gather the "pillars of aroma" first.
| Priority | What to buy | Role in the dish | Where to land if you substitute |
|---|---|---|---|
| Top | Red palm oil | The oil that supports the red color, nutty aroma and the mild sweetness of yam | Rice bran oil and paprika only get close in looks. The aroma is different, so add a little more seafood |
| High | Crayfish (dried shrimp) powder | Dry seafood umami close to crayfish powder | Bonito flake powder can support it, but it tends to taste Japanese-stock-like |
| High | Scotch bonnet-style sauce | Adds aroma and heat at the table without making the whole pot fiercely hot | Habanero sauce works, but products that are very sour or salty should be used a little at a time |
| Can wait | Imported white yam | The crumbly main texture closest to the local dish | Mix Chinese yam and taro and mash less |
Red palm oil is not an oil only for turning the dish red. The moment it goes in the pot, a nutty aroma rises and pulls the mild sweetness of the yam toward Nigerian cooking. A little crayfish powder gives stock, which is insurance when smoked fish is hard to find. A Scotch bonnet-style sauce is most useful in households where heat preferences differ. You don't make the whole pot fiercely hot; you add aroma and heat only on the adults' plates.
If you don't want to end your shopping with asaro, red palm oil and dried shrimp powder also carry over to egusi soup (in Japanese). The chile aroma also suits the finish of jollof rice, but Scotch bonnet sauce varies in saltiness and sourness by product, so adjusting at the plate rather than putting it straight in the pot keeps the flavor from breaking. It is a way of buying that makes it easy to spread to the same Nigerian table from what is left after asaro.
| Leftover ingredient | A dish to use it in next | Rough guide |
|---|---|---|
| Red palm oil | Egusi soup (in Japanese), abacha (in Japanese) | Use in small amounts as a cooking or dressing oil. The aroma is strong, so start with 1 tbsp |
| Dried shrimp powder | Egusi soup, seafood stews, a hidden seasoning in miso soup | From 1/2 tsp for unsalted products. Too much pushes the dried-goods smell forward |
| Scotch bonnet-style sauce | Jollof rice, suya, grilled fish | Don't mix into the pot; add a few drops at the plate. With very sour products, go easy on the lemon |
Thought of this way, the shopping for asaro is not a one-time special purchase but a small foundation for continuing to cook Nigerian food. Imported yam can be enjoyed when you happen to find it; keep the staples as red palm oil, seafood powder and chile aroma. Set in this order, the mental weight of shopping drops a good deal the next time you make a similar pot.
Method
Asaro looks like "just simmering," but the size you cut the yam, the amount of water and how much you mash change the result. Make the red sauce, let the yam absorb it, and at the end break it down just a little to set the thickness.
Ingredients to keep and substitutes in a home kitchen
The most important thing in substituting for asaro is what you replace the yam with. Sweet potato brings its sweetness to the front, so it is a poor substitute the first time. Made with potato alone it leans toward potato stew. Chinese yam is mild and easy to use, but has a lot of water and breaks down easily. Taro turns sticky, so mixed with Chinese yam it's easier to land at "crumbles softly but doesn't get too paste-like."
Getting close to the thickness served in Yoruba homes
The easiest asaro to eat leaves lumps when scooped with a spoon while a little red sauce spreads on the bottom of the plate. Translated into English as "yam porridge," you tend to imagine something thin, but in the local home-cooking sense it sits between a staple and a stew. If the corners of the yam all disappear in the pot, it feels monotonous as you eat. Conversely, if the lumps stay hard, the sauce and yam feel like separate dishes.
Judging by the trail of the wooden spoon reduces failures. If tracing the bottom parts the red sauce for a moment and it slowly closes back in two or three seconds, the thickness is right. If it closes back at once like water, remove the lid and reduce a few minutes over medium-low heat. If it is so firm that the trail stays and doesn't move, add hot water 2 tbsp at a time to loosen it.
| State of the pot | Cause | How to fix |
|---|---|---|
| Thin and not clinging to the yam | Too much water, or too little yam mashed | Take off the lid and reduce over medium-low heat, mashing a little more yam |
| Paste-like and too heavy | Chinese yam mashed too much, or too much taro | Add hot water in small amounts and stir from the bottom without breaking up the fish and greens |
| Aroma is weak | Too little red palm oil and crayfish powder | Before turning off the heat, stir in 1 tsp red palm oil and 1/2 tsp dried shrimp powder |
| Local ingredient | Substitute in a home kitchen | Why keep it |
|---|---|---|
| White yam | Imported yam, Chinese yam plus taro | Mild sweetness, breaks down but leaves lumps |
| Crayfish powder | Dried shrimp powder | Adds dry seafood umami |
| Smoked fish | Grilled mackerel, grilled salmon, unsalted-style dried fish | Smoke and fish aroma cut the monotony |
| Red palm oil | Red palm oil | Gives a nutty aroma, not only color |
| Ugu leaves | Spinach, komatsuna | Adds a green bitterness and color at the end |
On the first shopping trip, securing red palm oil and dried shrimp powder before looking for imported yam is more likely to succeed. Chinese yam and taro can bring the texture close, but without the oil and the aroma of dry seafood it gets closer to tomato-stewed starchy roots. If you do find white yam at an African grocery store, of course use it, but getting used to the aroma of red palm oil before buying one heavy, large piece makes adjusting next time easier.
When making it with Chinese yam and taro, managing moisture before it goes in the pot also matters. If Chinese yam soaks in water too long after cutting, the surface gets watery and the sauce thins when you break it down. Soak only enough to prevent browning, then drain in a strainer and leave about 5 minutes to remove surface water before it goes in the pot. Frozen taro also works, but don't put it in frozen; half-thaw it and shake off the frost on the surface to keep the thickness steady.
If substituting rice bran oil for red palm oil, it is easier on the mind to treat it as a different dish. Adding 1 tsp paprika to 2 tbsp rice bran oil gets close in red appearance, but not the aroma of palm oil. If you really dislike it, cut back on oil and support it from the umami side with a little more dried shrimp powder and fish.
You can make it without fish, but with it there is suddenly the depth that makes it Nigerian cooking. Unlike the grilled aroma of suya, in asaro the dry fragrance of smoked fish and dried shrimp powder holds up the yam, which has little sweetness. Leftover fish bones are hard to eat, so check carefully with your fingers before it goes in the pot.
How to eat, store and plan a menu
Eat asaro warm, fresh from the pot. Serve in a bowl and, as you like, add fried plantain, a boiled egg or grilled fish to make it a meal. If it isn't hot enough, put Scotch bonnet sauce in a small dish and let each person add it on their own plate rather than in the whole pot, which suits a family.
On days you want it complete in one dish, add protein with grilled fish or a boiled egg. On days you set it beside other Nigerian dishes, serve asaro a little smaller and leave room for the bean and leafy-vegetable dishes. The aroma of red palm oil is strong, so rather than stacking rich fried foods at the same table, placing one each of acidity, greens and a grilled aroma keeps you from tiring of it.
| How to build the table | Pair with | Good for |
|---|---|---|
| Eat as one dish | Grilled fish, boiled egg, a little greens | Weekday lunch, dinner with no rice cooked |
| Widen toward Nigeria | Akara (in Japanese), egusi soup (in Japanese) | Weekend days when several dishes go on the table |
| Split the heat | Mild pot, Scotch bonnet sauce at the table | Days eating with children or those who dislike heat |
| Lighten the aroma | Lemon, pickled onion, boiled greens | Days when the red palm oil aroma feels strong |
Store refrigerated up to the next day. Let it cool slightly and divide into shallow containers before refrigerating. The next day the moisture tightens and it becomes quite firm. To reheat, move it to a pot, add 3 to 4 tbsp water or stock, and slowly bring it back over low heat for about 8 minutes. In a microwave, heat at 600 W for 2 minutes, stir once, then heat 1 more minute. It should be hot through the center and regain its stickiness when stirred with a wooden spoon.
Freezing is not recommended, because moisture leaves the Chinese yam and taro and they tend to turn grainy after thawing. If you must keep leftovers, portion out only the fully mashed part and, when reheating, add water to bring it back toward a potage. The texture of the lumps is lost.
To widen it as a menu, it is fun to compare with jollof rice along the red line of Nigerian cooking. In jollof the rice grains take up the sauce, while in asaro the yam is broken down into the sauce, so even with the same tomato and chile they land in different places. Moving on to bean dishes, akara (in Japanese) is a good contrast, and for a rich soup of leafy vegetables and seeds, egusi soup (in Japanese).
Frequently asked questions
Can I make asaro with potatoes?
You can, but the asaro character weakens. Potato differs in sweetness and starch, and broken down it leans toward potato stew. If you must use it, go with 600 g potato and 300 g taro and mash less.
Is red palm oil essential?
It is close to essential. Paprika can make up the color, but the toasty aroma of red palm oil is hard to replace. The first time, start with 2 tbsp rather than 3 tbsp, and if the aroma feels too strong, adjust next time, which is less likely to fail.
Won't I have red palm oil and dried shrimp powder left over?
You will, but they are ingredients that carry over easily to other Nigerian dishes. Red palm oil and dried shrimp powder can be used as they are in egusi soup (in Japanese). Red palm oil also suits as a dressing oil for abacha (in Japanese). Unsalted dried shrimp powder can be used up in a little amount in miso soup or stir-fries, but for asaro, choosing one with a strong seafood aroma gets closer to the local crayfish powder.
Can I make asaro that isn't spicy?
Yes. Use 1/4 Scotch bonnet with the seeds and pith removed, and increase the red bell pepper. But leaving the chile out completely can let the red palm oil and fish aroma come too far forward. For children, make the whole pot mild and add hot sauce only to the adults' plates.
Does it work without fish?
It works, but the depth of flavor is shallower. If avoiding fish, add just 100 ml of dried shiitake soaking liquid and support it with bonito flake powder or kombu stock. To lean vegan, also leave out the dried shrimp powder and build the aroma by sautéing the red palm oil and onion a bit more carefully.
How far ahead can I prepare it?
Only the pepper base can be made the day before. Refrigerate for one day and check the smell before using. Cut yam browns easily if left long, so cutting it the same day is safer. If you must cut it ahead, soak it in water, refrigerate it and use within half a day.
