To prepare a stuffed pepper soup iv recipe, first you need to prepare the peppers. Cut the bell pepper in half lengthwise and scoop out the seeds. Place the seeded pepper halves in the crock pot and cover with water. Bring the water to boil, then reduce the heat to low and simmer for 20 minutes. Remove the pot from heat and add the chopped onion. Cook until the onion is soft and translucent. Add the tomato paste and salt and pepper to taste. Cover and cook for an additional 10 minutes, or until thickened. Serve with sour cream or guacamole.