Next put the tomatoes in a sauce pot and heat to simmering. Add onions, garlic, sweet peppers, herbs and salt and pepper to taste. The herbs I like to add are basil, oregano and thyme. I will also add a tablespoon of honey if the sauce is too sour. If you like hot foods, you can add a whole or chopped hot pepper. If you add a pepper whole be sure to remove it before serving. I also sometimes steam or boil carrots on the side and then puree them and add them to the sauce to make it thicker and a bit more nutritious.
Continue to simmer the sauce uncovered until it reaches your desired consistency. This usually takes about 30-45 minutes. The longer you cook it the more water that will boil off and the thicker the sauce becomes.
Use immediately, store in a sealed glass jar in the fridge for up to a week, or freeze for up to a year.