How to Make It
In a medium saucepan, combine the tomatoes with the sugar, water, lemon zest, allspice and cinnamon and bring to a boil over high heat, stirring occasionally. Reduce the heat to moderately low and simmer briskly, stirring occasionally, until thickened and reduced to 1 1/2 cups, about 25 minutes.
Remove the lemon zest. Pass the ketchup through a coarse strainer, pressing on the solids; discard the solids. Let cool to room temperature and season with salt and pepper.