How to Make Homemade Tomato Sauce

-Ingredients:
2 pounds of fresh, ripe tomatoes (about 9 medium-sized)
2 tablespoons of olive oil
1 medium onion, finely chopped
2 cloves of garlic, minced
A handful of fresh basil leaves, chopped (or 1 teaspoon dried basil)
Salt and pepper to taste
-Preparation Steps: