Cod with Peanut, Ginger and Avocado Sauce

I made this dish after a trip to look at the peanut industry in Georgia, in America’s Deep South. On our first evening our hosts, the peanut farmers, welcomed us with an unusual grace: ‘Dear God, we thank you for our British friends and for the interest in peanuts which has brought them here.’ I left Georgia not much more enamoured with peanuts than I had been before, yet in some savoury dishes and sauces I really could see their point for the first time.