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Achi (Soup Thickener) substitute

Best substitute

Ofor Flour

Use the same amount as the achi (soup thickener) you are replacing

Best for ofe oha

Close match

The closest swaps for achi are ofor flour or ukpo (ukpor) seed flour, used 1:1 - both are Igbo seed thickeners that behave almost identically. If you have neither, pounded cocoyam gives a smooth, heavier body, and ground egusi (melon seed) thickens while adding its own nutty richness. A cornstarch slurry will thicken the liquid but adds no body or flavour, so treat it as a last resort.

Other achi (soup thickener) substitutes

Ranked, with the exact amount to use

Substitutes for Achi (Soup Thickener) with ratios

  1. 2Ukpo (Ukpor) Seed Flour

    Different taste

    ¾ of the achi amount, then more to taste

    Ground seed flour used the same way as achi across south-eastern Nigeria.

    What changes
    Best for
    ofe nsala, yam pepper soup, oha soup, abacha sauces

    Thickens harder than achi for the same amount, and the pull is more elastic. It also tastes distinctly nuttier, so a white soup made with ukpo reads richer and slightly heavier. Start with three quarters of the achi amount and add more if you want it thicker.

  2. 3Pounded Cocoyam (Ede)

    Taste and texture differ

    Use 3-4 small cocoyams for every medium pot of soup

    Cocoyam corms boiled until soft, then pounded or blended to a smooth paste and dropped into the simmering soup in small lumps.

    What changes
    Best for
    ofe onugbu (bitterleaf soup), oha soup, nsala, long-simmered stews

    The traditional alternative rather than a compromise. It gives a heavier, glossier, completely smooth body with no draw at all, plus a faint earthy sweetness. Cocoyam must be fully cooked before it goes in, and the lumps need about 10 minutes of simmering to melt into the soup. Not a good choice if you want the soup thin enough to drink.

  3. 4Ground Egusi (Melon Seed)

    Taste and texture differ

    Use 3 tablespoons ground egusi for every 1 tablespoon achi

    Ground white melon seeds, which thicken through their own starch and fat rather than acting as a pure thickener.

    What changes
    Best for
    egusi-style soups, vegetable soups, goat meat stews

    Thickens reliably but changes the dish: it adds oil, a soft grainy texture and a pronounced roasted-seed flavour, so a nsala made this way tastes like a mild egusi soup instead. Toast it dry for a minute first if you want that flavour to read as deliberate rather than raw.

  4. 5Yam Flour or Instant Potato Flakes

    Different taste

    Use the same amount whisked into a little hot broth first

    Neutral starchy flours that thicken smoothly without adding flavour.

    What changes
    Best for
    pepper soups, quick weeknight stews, when nothing else is available

    Thickens well and stays stable through reheating, but the soup tastes exactly as it did before, only thicker - you lose achi's soft nutty aroma entirely. Add gradually: both go gluey fast if you overdo them, and potato flakes in particular can make the soup taste faintly of mashed potato.

  5. 6Cornstarch Slurry (Least-Best Option)

    Taste and texture differ

    Use 1 tablespoon cornstarch mixed with 2 tablespoons cold water for every cup of soup

    A standard starch slurry stirred in at the end of cooking.

    What changes
    Best for
    emergency thickening only

    Honestly, this is not a substitute for achi so much as a way to stop your soup being watery. It thickens glossy and slick rather than soft and clinging, contributes no flavour, and thins out again if the pot sits on the heat or gets reheated the next day. If it is all you have, use it, accept a thinner-bodied soup, and lean on more crayfish, stockfish or palm oil for depth.

What is Achi (Soup Thickener)?

Achi (Soup Thickener) is Achi is a pale, nutty-smelling flour ground from the seeds of the West African Brachystegia tree, used in Nigerian cooking purely to thicken soups.

Cooking tips

  • Achi does one job: it gives body. It is not a flavour ingredient, so if your soup tastes flat, the fix is more crayfish, stockfish, palm oil or seasoning, not more achi.
  • Never tip achi powder into a still pot. Sprinkle it over the surface a little at a time while the soup is at a gentle boil and stir constantly, or whisk it into a ladle of hot broth first and pour that back in - it lumps instantly in cold or unstirred liquid.
  • Start with about a tablespoon per two to three cups of liquid and give it three to five minutes to work. Achi keeps tightening as it cooks and again as the soup cools, so a pot that looks right off the heat can be stodgy by the time it reaches the table.
  • Add it near the end, after the meat and fish are tender. Once a soup is thickened, heat moves through it more slowly and it scorches on the bottom of the pot easily.
  • Achi, ofor and ukpo are all seed flours and naturally gluten-free, but they are usually milled and bagged in the same places as other flours, so check the label if you are cooking for someone with coeliac disease.
  • Buy achi in small quantities and keep it airtight in the freezer. It is a fatty seed flour and it turns stale and faintly bitter within a few months at room temperature.

Frequently asked questions

Can I just leave achi out?

Yes, and nothing will be ruined - you will simply have a thinner soup. Soups like nsala and oha are defined by their thick, spoon-coating body, so leaving the thickener out changes the eating experience more than the taste. If you have no thickener at all, simmer the pot uncovered a little longer to reduce it, and be generous with ground crayfish and stockfish, which add a little body along with flavour.

What is the difference between achi, ofor and ukpo?

All three are ground West African seeds used as soup thickeners, and cooks swap them freely, but they are not identical. Achi is the mildest and gives a smooth, soft body. Ofor thickens similarly but draws a bit more and has a faintly bitter, resinous note. Ukpo (ukpor) is the strongest of the three: nuttier in flavour and noticeably more elastic in the pot. If you are swapping ofor or ukpo in for achi, taste as you go rather than assuming a straight measure.

How much achi do I need for a pot of soup?

Roughly one tablespoon of achi powder per two to three cups of liquid, added near the end and stirred in over a couple of minutes. It is easier to add more than to fix a soup that has gone gluey, so build up in stages and remember it thickens further as it cools.

Is achi gluten-free?

Achi is a seed flour with no wheat in it, so it is naturally gluten-free, as are ofor and ukpo. The usual caution applies: these are often ground and packed in mills that also handle wheat, so if you are cooking for coeliac disease, look for a packet that states it clearly.

Can I use plain flour instead of achi?

You can, but make a slurry with cold water first and expect a pasty result - wheat flour thickens with a dull, floury taste that shows up clearly in a light soup like nsala. Yam flour or instant potato flakes are better neutral options, and pounded cocoyam is better still.

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