Step 1 Put the oil in a saucepan. Chop the onion very fine, add to the pan and fry over low heat until softened. Add the peppers, salt, ginger and mixed spices, and simmer 10 minutes.
Step 2 Stir in the tomatoes, garlic, raisins and sugar. Add the vinegar; cook over very low heat, covered, at least 1 hour and 15 minutes, stirring occasionally.