This recipe makes a huge batch, so if you want to make less just cut the measurements in half.
12 medium sized tomatoes
1 large white or sweet onion
8 garlic cloves
2/3 cup fresh basil leaves
1/3 cup olive oil
Cut up tomatoes into large chunks and cut out the cores. Dice onion and garlic cloves.
Heat large pot on medium and add olive oil, tomatoes, onion, and garlic. Cover the pot and simmer until everything starts getting soft and breaking down. Stir often.
Add whole basil leaves and simmer for a few more minutes.
Take off heat and let cool. Once cooled off, put into blender a few cups at a time and mix until smooth.
Pour into glass containers and store in fridge or freezer.