SERVES 6 TO 8
2 tablespoons extra-virgin olive oil, plus more for serving
1 medium onion, finely diced (about 1 cup)
2 medium carrots, peeled and finely diced (about 1 cup)
2 stalks celery, finely diced (about 1 cup)
4 medium cloves garlic, minced or grated on a
Microplane (about 4 teaspoons)
6 cups homemade or low-sodium canned chicken stock
1 cup diced canned tomatoes, with their juice