Heat the oil: Warm 2 tbsp olive oil in a saucepan over medium heat.
Sauté aromatics: Cook minced garlic and chopped onion until soft and fragrant.
Add tomatoes: Stir in chopped fresh or canned tomatoes and mix well.
Season the sauce: Add salt, pepper, herbs, chili flakes, and onion powder.
Simmer: Let it simmer uncovered for 20–25 minutes, stirring occasionally.
Balance the flavour: Add apple cider vinegar and keto sweetener, then stir.
Blend (optional): Use a blender if you want a smooth sauce texture.
Let it rest: Turn off heat and rest the sauce for 5 minutes before use.