Finely dice the onion and crush the garlic. Heat the olive oil in a saucepan over a low/medium heat. Add the onion and garlic and sweat gently for 2-3 minutes until tender and fragrant.
Step 2
Add the chopped tomatoes, balsamic vinegar, and dried oregano. Roughly chop the basil and add to the pan along with the salt and pepper. Stir to combine. Bring the sauce up to a gentle boil.
Step 3
Reduce the sauce to a simmer. Continue to cook for 10-15 minutes until thickened and reduced. Taste and adjust seasonings as desired. You may also add a little water if you prefer a thinner sauce. Use as desired with your preferred Keto recipes.