In saucepan over medium heat, sauté onion in about 2 tbs of olive oil for about 5-7 minutes
Add garlic, stir one minute
Add sausage, brown until cooked through
Drain fat
Next add the peeled tomatoes and tomato sauce, followed by the herbs and (optional) pepper flakes
Taste sauce and add salt and pepper as needed
Turn down heat and allow sauce to simmer uncovered for about 30 minutes, stirring occasionally
Serve immediately, or cool then store in air-tight freezer bags/containers