Steps
1. Start by roasting the bell pepper in a preheated oven at 400°F (200°C) for about 20 minutes until the skin is blistered and charred.
2. Remove the pepper, let it cool, then peel off the skin and remove seeds.
3. In a pan, heat the olive oil over medium heat. Add the chopped onion and sauté until translucent.
4. Add the minced garlic and sauté for another minute until fragrant.
5. Chop the roasted bell pepper and add it to the pan. Stir for 2-3 minutes.
6. Pour in the heavy cream, stir well, and let it simmer for about 5 minutes.
7. Blend the mixture until smooth, then season with salt and black pepper to taste.
8. Serve warm, garnished with fresh basil.