Another way to ferment fish: buy some fresh sardines (also works for herring and mackerel), de-scale the fish, cut the heads off and clean the belly out. Put into a suitable size glass jar or a stainless steel pan. Add 1-2 cups of whey, 1-2 tablespoons of salt (per 1 litre), a teaspoon of black pepper corns (freshly crushed), 10 bay leaves and ½ a teaspoon of coriander seeds (freshly crushed). Top up with water so the fish is completely covered with water, you may want to float a small plate on top of the fish to keep it submerged in the brine. Cover the pan or put the lid on the jar and let it ferment for 3-5 days at a room temperature. When the fish is ready take the meat off the bones, cut into bite-size pieces and serve with avocado, fresh dill and some chopped red onion.