Tomato and Bean Soup

In a small skillet over medium heat, cook onions in butter and oil until tender.

Meanwhile, in a medium saucepan, bring water to a boil Pour beans and tomatoes into water. Stir cooked onions into mixture and simmer 5 minutes. Puree with the pepper sauce and ketchup in a blender or food processor, or using an immersion blender. Return to heat, season with salt and pepper, and heat through.