In a 4-quart slow cooker, add whole peeled tomatoes and tomato puree - both undrained.
Next, add the tomato paste and stir.
Finally, add the salt, black pepper, red pepper flakes, Italian seasoning, and sugar. Stir.
Place the cover on and cook on low for 5-6 hours or 2-3 hours on high.
Before serving, add the garlic oil and stir until combined.
Chop the fresh basil leaves and sprinkle over the sauce.
Serve over gluten free noodles with grated parmesan cheese.
Notes
Note 1: Use San Marzano-style tomatoes for the best results.Variations: Add in one pound of cooked ground beef or one pound of Italian sausage after pasta sauce is cooked. Low FODMAP Notes: Low FODMAP ingredient guidance is based on the Monash University Food App and FODMAP Friendly App testing results.