An easy one:

Saute a little chopped garlic in a little olive oil, add a large can of crushed tomatoes and some fresh sweet basil leaves (you can use dry but fresh is best). Simmer until you achieve desired thickness and you can add a little sugar to taste to make it less bitter/tart...add only about 1/4 tsp. at a time or it will be too sweet. Taste as you are cooking and add what you wish as you go along. I cook this by taste but always makes an awesome pizza sauce!