Heat the olive oil over medium heat in a large saucepan. Add the garlic and onion; sauté for 3-4 minutes until the onion is soft and translucent.
Add remaining ingredients and simmer, covered, over low heat for 20 minutes, adding water if needed for consistency (expect that 1/2-1 cup may be required). Add the salt 1/4 teaspoon at a time; taste to see if you should add more. Add black pepper and stir to combine.
Serve immediately over spiralized zucchini, whole wheat or bean pasta or freeze in an airtight container for up to 6 months.
Notes
Add sliced mushrooms or chopped bell pepper to yellow onion, garlic, olive oil sautee if desired for extra veggies. Serve over spiralized zucchini, whole wheat or bean pasta. Makes great leftovers and freezes well, too.