Preheat your oven to 400 degreesĀ
Place the halved tomatoes, sliced onions and garlic bulb (cut side up) on a large baking sheet
Drizzle 1/4 cup of olive oil over everything, toss to coat and season generously with salt and black pepperĀ
Sprinkle 2 tablespoons of brown sugar over the onions and add the fresh thyme and oregano
Roast the tomatoes, onions and garlic for 45 minutes (flip the onions several times to ensure even caramelization)
Remove the thyme and oregano and transfer the roasted tomatoes and caramelized onions into a blender
Squeeze the roasted garlic cloves out of the bulb and place them in the blender
Add 2 tablespoons of butter, 1/2 cup of heavy cream, 2 cups of vegetable stock, a pinch of red pepper flakes and 1/2 cup of finely shredded parmesan into the blender
Blend until smooth
Add more broth, salt, pepper or crushed red pepper flakes, if necessary
Enjoy!