Preheat oven to 375 degrees. Line two cookie sheets with foil or parchment.
Place tomatoes on one baking sheet. Place garlic in foil on remaining baking sheet. Place
onion and carrot on sheet with garlic and drizzle with oil. Bake one hour, turning once.
Mash roasted veggies in a saucepan. Squeeze in all the roasted garlic. Add tomato puree
and simmer covered for one hour. Season as desired. Cover and refrigerate leftovers.