Achi (soup thickener) substitutes

Flour from Detarium microcarpum seeds, the thickener most often sold next to achi in the same market stall.

Best for

ofe oha, ofe nsala (white soup), bitterleaf soup, egusi soup

The nearest thing to a straight swap. Ofor draws slightly more, so the soup pulls a little when you lift the spoon, and it carries a faintly more bitter, resinous edge than achi's mild nuttiness. Same amount, added the same way: sprinkle it in while stirring so it does not clump.

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

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.

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

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.

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

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.

Neutral starchy flours that thicken smoothly without adding flavour.

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.

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

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.