Slice the peaches off their stones. Cut the tomatoes and peaches into 5 mm dice. Strain the juice from the tomato seeds and skins and reserve.
Combine the tomatoes and peaches and the strained tomato juice in a large, reliable, heavy-bottomed pan. Add all the other ingredients.
Bring to the boil, lower the heat and simmer for about 1½-2 hours or until thick. Transfer to clean wa