Directions

1. Preheat oven to 450°F.
2. Place the quartered tomatoes and onion onto a large baking sheet and toss with the olive oil, Italian seasoning, and salt.
3. Roast for 30-40 minutes.
4. Remove from the oven and transfer everything to a large bowl.
5. Use an immersion blender to blend until mostly smooth. (Alternatively, you can transfer everything to a blender and blend until mostly smooth.)