To prepare a red pepper sour cream sauce sauces recipe, first you will need to prepare the ingredients for the sauce. First, you'll need the following ingredients: Red peppers: Cut the red bell pepper in half and remove the seeds. Then, cut the white part of the pepper into quarters. Add the chopped onion and garlic to the saucepan and cook over medium-low heat until the onions are translucent and the garlic is fragrant, about 5 minutes. Remove the pan from the heat and add the tomato paste. Allow the mixture to cook, stirring occasionally, until it thickens, 2 to 3 minutes, or until thickened, 3 to 4 minutes more. If you don't want to use the tomatoes, then you can add them to your sauce as well.