Mangia! Mangia! Minestrone

Name: Mangia! Mangia! Minestrone
Ingredients: ¼ cup (60 ml) extra virgin olive oil, plus extra for drizzling; 1 large onion, chopped; 3 sticks celery, finely diced; 2 carrots, finely diced; 1 potato, finely diced; 2 cups shelled fresh borlotti beans (from 1 kg whole pods); 2 zucchini (courgettes), finely chopped; 6 tomatoes, peeled and chopped or 400 g Pomodoro Pelati; 4–5 pieces (about 500 g) veal osso buco; 3–4 silver beet leaves; 200 g maltagliate (off-cuts from making fresh pasta) or small dried pasta (such as ditali); grated parmigiano reggiano, to serve