Periwinkles (Isam) substitute

Substitutes for Periwinkles (Isam) with ratios

1. 2Small Clams (Manila, Littleneck or Canned Baby Clams)

   Different texture

   Use the same amount by shelled weight

   Small hard-shell clams, shelled, or drained canned baby clams.

   What changes

   Best for

   afang and edikang ikong, seafood pepper soup, okra soup

   Widely available and genuinely good here: briny, sweet, and small enough to eat in one bite. They are softer and juicier than periwinkle rather than firmly chewy, and fresh ones release liquor that thins a thick soup a little, so shell them separately and add just the meat. Drain canned clams well, since the packing liquid tastes tinny in a palm oil soup.

2. 3Canned Whelks or Escargot

   Close match

   Use the same amount by weight, rinsed well

   Larger sea and land snails sold cooked in cans or jars.

   What changes

   Best for

   matching the chew, afang soup, nkwobi-style dishes, fisherman soup

   Texturally the truest swap, because these are actual snails: dense, firm and pleasantly rubbery in the same way. Cut them into periwinkle-sized pieces. Whelks are briny and mineral, close to the original; canned escargot is milder and often packed with butter and herbs, so rinse thoroughly or those flavours turn up uninvited in your soup.

3. 4Cooked Mussels, Roughly Chopped

   Taste and texture differ

   Use the same amount by shelled weight

   Steamed or frozen cooked mussel meat, chopped to bite size.

   What changes

   Best for

   everyday cooking, seafood soups, when nothing smaller is available

   Easy to find and completely serviceable. Mussels are noticeably sweeter and much softer than periwinkles and they can shred if the pot simmers on, so stir them in off the heat or in the last two minutes. The soup gains a distinctly mussel-like sea aroma, which is pleasant but not neutral.

4. 5Squid or Octopus, Cut Small

   Different taste

   Use the same amount by weight

   Cleaned squid rings or cooked octopus cut into small pieces.

   What changes

   Best for

   texture-first substitution, afang, seafood okra soup

   This is the swap to choose if the chew is what you miss. Squid gives an almost identical springy resistance, and octopus is even closer. Neither brings much brininess, so add a teaspoon of ground crayfish or a splash of fish sauce alongside. Squid needs either two minutes or forty - anything in between turns it into rubber bands.

5. 6Ground Crayfish or Dried Shrimp (Flavour Only)

   Different texture

   Use 1-2 tablespoons for every pot

   Dried, ground West African crayfish or dried shrimp, already a staple in most of these soups.

   What changes

   Best for

   restoring the sea flavour when no shellfish is available, budget cooking

   This replaces the flavour and none of the texture, which is an honest trade rather than a compromise: most Nigerian cooks already have it in the cupboard and it is where much of the soup's savoury depth comes from anyway. The soup will taste right and simply have no chewy morsels in it.