Pasta in Tomato Sauce

For Pasta Follow cooking instructions on package Instruction for Tomato Sauce Heat the olive oil in a large saucepan over medium heat. Add the onion and garlic, and cook for 5 minutes. Add the tomatoes, tomato paste, oregano, basil, and red pepper flakes, if using. ... Reduce heat to medium-low and simmer until sauce thickens slightly—about 20 minutes.