Follow these easy steps to create your delicious Roasted Tomato Basil Soup:

1. Preheat the Oven: Preheat your oven to 400°F (200°C).
2. Prepare the Tomatoes: Place the halved tomatoes on a baking sheet, cut side up.
3. Add Onion and Garlic: Scatter the chopped onion and minced garlic around the tomatoes.
4. Season: Drizzle with olive oil and season with salt, pepper, and sugar.
5. Roast: Roast the tomatoes, onion, and garlic in the preheated oven for about 25-30 minutes until they are caramelized and fragrant.
6. Blend: Once roasted, transfer everything to a large pot. Add vegetable broth and blend with an immersion blender until smooth.
7. Heat the Soup: Heat the blended soup over medium heat for about 5-10 minutes. If desired, add heavy cream to make it richer.
8. Add Basil: Stir in the chopped basil and balsamic vinegar, letting it simmer for another 5 minutes.
9. Taste and Adjust: Taste and adjust seasonings as necessary. You may want to add a touch more salt or sugar based on your preference.
10. Serve: Remove from heat and serve warm, garnished with fresh basil leaves if desired.

By following these steps, you can easily prepare a comforting bowl of Roasted Tomato Basil Soup that everyone will enjoy.