Add the black beans, pinto beans, kidney beans, and crushed tomatoes. Give it a good mix, then pour in the veggie stock, dark cocoa powder and sugar. Stir well to combine.
1 can (14 oz / 400 g) black beans
1 can (14 oz / 400 g) pinto beans
1 can (14 oz / 400 g) red kidney beans
2 cans (14 oz / 400 g) crushed tomatoes
1 cup vegetable stock
1 tablespoon dark cocoa
1 teaspoon sugar