Heat olive oil in a pan, add grated onions and garlic, cook gently to remove water content.
Add herbs, fresh and tinned tomatoes, adjust acidity by tasting and reducing.
Simmer the sauce, then transfer to an oven-safe dish wrapped with foil.
Bake at 150°C for 1 hour for flavor infusion.
Strain the sauce through a chinois for a smooth texture.
Use as a base sauce for various dishes.
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