INGREDIENTS
1/2
sweet onion ((diced))
1/4 cup
vegetable broth (or water) ((plus 1-2 tbsp more, if needed))
3
garlic cloves ((minced))
1 tsp
crushed red pepper flakes
28 oz
canned crushed tomatoes
1/2 tsp
salt ((or to taste))
2 tsp
dried basil
1 tsp
dried oregano
1 tsp
balsamic vinegar