Method
Open cans of tomatoes and pour into a large bowl. Crush tomatoes into small chunks with your hands or another utensil.
Place butter, oil, sea salt, pepper, and onion in a large skillet and cook onion over medium heat until soft.
Add garlic and red pepper flakes to the same pan and cook until fragrant.
Pour in crushed tomatoes from the large bowl into the same skillet. Stir to combine and simmer for about 15 minutes over medium heat.
Add cream, stir to combine well, then simmer over medium heat for another 10 minutes.
Stir in basil and simmer for another 5 minutes over medium heat.
Find crushed garlic in sauce pieces and discard. (optional)
Serve with pasta and grated cheese!