Preheat your oven to 400F and line a large baking sheet with parchment paper.
Cut the large tomatoes in half and place, cut side up, on the pan with the cherry tomatoes and onion chunks.
9 medium Tomatoes, 2 cups Cherry Tomatoes, 1 large White Onion
Cut the tops of the garlic heads, just enough to expose the cloves. Drizzle with olive oil and wrap up in a foil pouch.
3 heads Garlic, 2 tablespoon Olive Oil
Drizzle the tomatoes and onion olive oil and sprinkle with salt. Roast the tray in the preheated oven for 40 minutes. Remove from the oven and let everything cool for 20 minutes.
2 teaspoon Salt
Transfer the roasted tomatoes and onion in the jar of a high powered blender. Squeeze the garlic cloves out of the bulb and place in the blender. Add the broth and blend until smooth. You can also use an immersion blender to do this.
2 cup Chicken Broth
Transfer the blended soup to a soup pot and heat it back up when ready to serve. See recipe notes for tips and tricks on how to adjust your tomato soup.
Notes
Troubleshooting Your Roasted Tomato and Garlic Soup
Too acidic: Stir in a teaspoon of sugar, a drizzle of honey, or a splash of cream to mellow out the sharpness.
Too thick: Add a little vegetable or chicken broth and blend or stir until you reach your preferred consistency.
Too thin: Simmer the soup uncovered for a few extra minutes to reduce the liquid and intensify the flavor.
Too bland: Season more generously with salt and freshly cracked black pepper, or brighten the flavors with a squeeze of lemon juice or a dash of balsamic vinegar.