Using red bell peppers as the main ingredient for this sauce is great for those of us who react badly to tomatoes but really have a hankering for a red sauce. As written, the recipes does include a dollop of tomato paste but it may be left out. The recipe specifies using dark miso for its salty taste and sweet soy sauce for sweetness. They are wonderful "umami bombs" that deserve a place in any kitchen. If you don't have these at hand, any salt and sugar can be used to adjust the sauce taste to your liking.