In Kerala, families dry slices of raw nendran banana in the sun, grind them to a cream-coloured flour and cook it into kurukku, a smooth, thick porridge that has been a baby's first food in the state for generations. It is usually given mid-morning, and grandmothers often keep a jar of home-made ethakka podi for each new grandchild. It tastes gently sweet and slightly earthy. It contains none of the common allergens (milk, egg, gluten, peanut, tree nuts, soya, sesame, fish). Chef's tip: to make the powder at home, peel raw nendran bananas, slice them thinly, dry them in a low oven or the sun until brittle, then grind and sieve.