
1 pound ground sweet Italian pork sausage
1 tablespoon olive oil
1 medium yellow onion, finely chopped (1½ cups)
3 ribs celery, finely chopped (1½ cups)
2 medium carrots, peeled, quartered and diced (1 cup)
1 cup fresh green beans, trimmed and cut into thirds
2 cloves garlic, minced
1 teaspoon coarse kosher salt
½ teaspoon coarsely ground black pepper
6 cups vegetable stock
2 (14.5-ounce) cans diced tomatoes, undrained
1 (15.5-ounce) can cannellini beans, drained and rinsed
1 (15.5-ounce) can garbanzo beans, drained and rinsed
1 cup dry gemelli or rotini pasta
1 small green zucchini, cut into half-moon slices
1 tablespoon finely chopped fresh oregano, plus additional for garnish
Toasted Italian bread slices, for serving