Tilapia Fish pepper soup would have to be one of my favourite Nigerian Fish Pepper Soup. It is so simple to cook and takes less than 20 minutes. Tilapia and Yam Pepper soup is really just parboiled yam cooked in fish broth. The best fish to use is Catfish as it is naturally tasty however, Tilapia is easier to come by in these parts, so I find myself using Tilapia more often than not. The secret to well cooked fish pepper soup is cooking from start to finish on low heat, this helps to preserve the taste and consistency of the fish throughout the cooking process.