– 2 tablespoons olive oil
– 1 onion, diced
– 1 stick celery, diced
– 1 large carrot, diced
– 2 cloves garlic, minced
– 2 14-ounce cans whole peeled tomatoe
– 1 tablespoon tomato puree
– 4 cups chicken stock
– 2 teaspoons sugar
– salt, to taste
– pepper, to taste, plus more for garnish