1lb 5 oz green tomatoes, cored
1lb green cabbage, cored
9 oz red bell peppers, free of seeds and pith
5 oz white onion, peeled
1 tablespoon kosher salt
6 fluid oz white wine vinegar
6 fluid oz apple cider vinegar
11 oz granulated sugar
2 tablespoons black mustard seeds
1/2 teaspoon celery seed
1/2 teaspoon ground turmeric
1/2 teaspoon ground ginger
1/2 teaspoon ground allspice
Rough chop the green tomatoes, peppers, onions and cabbage. Combine with the salt, mix well, and let sit under refrigeration overnight. Drain the vegetable mixture of all liquid and grind the vegetables in a meat grinder attachment or chop coarsely in a food processor.
Combine the vegetables, vinegars, sugar and spices in a non-reactive pot (not aluminum) and bring to a boil and reduce to a simmer until the liquid reduces to 95%; it should be nice and thick/syrupy. Let cool to room temperature and drain any excess liquid so it resembles a relish consistency.