To prepare the roasted red peppers, first preheat grill or oven to 425ºF (220ºC). Wash and slice peppers into halves or wedges removing the stems and all seeds. Drizzle with a little olive oil and roast on a grill or baking sheet for 15 minutes just until the edges begin to char, turning halfway through.
While the peppers are roasting, melt the butter in a soup pot or Dutch oven then add the onion and rosemary and cook gently over low heat for 5 minutes. Remove the rosemary and discard.
Stir in the peppers and vegetable broth and bring to a boil. Cover and let simmer for 15 minutes.
Stir in the tomato paste. Next, using an immersion or high-speed blender, purée until smooth. Return to pot, stir in cream and season with smoked paprika, salt and pepper.
Serve the soup hot or at room temperature with your topping(s) of choice.