Step 1

Remove ends of tomatoes before quartering.

Step 2

Combine tomatoes, onion, and garlic in a large glass baking dish.

Step 3

Sprinkle with salt and pepper and stir to combine.

Step 4

Pour olive oil over tomatoes and stir to mix.

Step 5

Add basil, red pepper flakes, and oregano. Stir to combine.

Step 6

Add bay leaf in the center of the mixture.

Step 7

Place baking dish in 450-degree pre-heated oven for 1 hour, stirring occasionally.

Step 8

When done, let dish cool for 1 hour.

Step 9

When cooled, remove bay leaf and discard.

Step 10

For a chunkier sauce, mash mixture with a potato masher to desired consistency.

Step 11

For smoother sauce, transfer mixture to a food processor and puree.

Step 12

Transfer sauce to a sealable container and refrigerate or freeze until ready to use.