Once the bell peppers are prepped and ready, combine everything but the olive oil (roasted bell peppers, almonds, sun-dried tomatoes, garlic, vinegar, paprika, sea salt, and cayenne pepper) in a food processor or blender. Once the ingredients are mostly blended, start drizzling in the olive oil while running the blender/food processor on low. Blend on medium until you reach your desired consistency (I like my Romesco sauce pretty creamy, but you might prefer it with a more chunky texture).