Curtido: mix the finely chopped white cabbage, grated carrot, julienned purple onion, add a pinch of oregano and salt to taste, pour the 1/2 cup of white vinegar and let stand for 20 minutes.
Sauce: blend the ingredients until you get a puree consistency, put it to cook letting it boil for at least 30 minutes until the tomato is well cooked, when the sauce starts to boil taste and correct the seasoning if necessary (you can add powdered chicken broth or vinegar).