Roasting and Preparation

• Preheat oven to 400 degrees F. Line a large baking sheet with parchment paper. Place halved tomatoes and garlic cloves on the baking sheet and drizzle with 3 tablespoons of olive oil. Generously season with salt and pepper. Roast in the oven for 40-45 minutes.
• While the tomatoes are roasting, you can make the caramelized onions: Add ½ tablespoon olive oil to a large pot and place over medium heat. Add the onion slices and stir to coat the onions with olive oil. Cook, stirring occasionally, until caramelized and golden, about 20 minutes.
• Once tomatoes and garlic are done roasting, allow them to cool for 10 minutes, then add them to a food processor or high powered blender and blend until smooth. Next add basil and caramelized onions and blend again. Alternatively, use an immersion blender in the large pot.
• Transfer blended soup back to pot, turn to medium-low heat and add in oregano, vegetarian broth, and salt and pepper to taste. Allow to simmer for 10 minutes before serving. Garnish with parmesan cheese and serve with grilled cheese, if desired.