In a large and heavy sauce pan or pot, heat the olive oil and cook the garlic until fragrant.
Add the tomatoes to the pan and let them simmer until the juices are released and the tomatoes cook down, about a half hour.
Taste and season with salt and pepper .
Use a food mill to remove the skins and seeds. If you don’t have a food mill, smooth the sauce with a blender. A vitamix works great. Once the sauce is smooth, add the chopped basil.
Cool and place in freezer containers or bags with label and date.