In food processor, blend ginger, garlic, and chili peppers until finely chopped. Add to processor 2 cans tomatoes, peanuts, and onion; leave chunky (you may need to do this in batches.) Place mixture in soup pot and add 1 can tomatoes, chicken stock, water, and chicken. Make a paste of butter and flour and add to pot. Bring to a boil.
Let cool to 145º (comfortable eating temp.) and serve each bowl topped with a few peanuts and juice from one lemon wedge. Serve with extra crushed chili peppers, and a loaf of French bread with butter.