How to Make It
In a large saucepan, combine the tomatoes and the orange and lemon slices with the sugar, cider vinegar, ras el hanout and ginger and bring to a boil. Simmer over moderate heat, stirring often, until thick and jam-like, about 45 minutes. Let cool and season with salt.
Ras el hanout, a Moroccan spice blend, is available at specialty-food shops, Middle Eastern grocery stores and online at mustaphas.com. It can also be substituted with 1/3 teaspoon each of ground cinnamon, coriander and turmeric mixed with a pinch of cayenne pepper.