Step 1Put 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 2Stir 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.