Many store-bought tomato sauces have heaps of added sugar to tame the natural acidity of tomatoes. Plus, they're usually loaded with sodium. But if you can turn on an oven, you can make a healthy sauce from scratch. And it tastes really good, too.
Any type of tomatoes will work. Romas are our favorite. Their mild-sweet flavor is consistent from season to season. Beefsteak tomatoes have more water, so you'll have to cook the sauce longer. And, depending on the variety, heirloom tomatoes can affect a sauce's color.