Spicy Kale, White Bean and Orzo Soup

Name: Spicy Kale, White Bean and Orzo Soup
Prep time: 10 min
Cook time: 20 min
Total time: 30 min
Cuisine: European, Mediterranean
Ingredients: 1 tablespoon olive oil; 1 medium white onion, peeled and diced; 1 stalk of celery, thinly sliced; 4 cloves garlic, minced; 1 teaspoon crushed red pepper flakes; 8 cups vegetable stock (or chicken stock); 2 (15-ounce) cans white beans, rinsed and drained; 2 bay leaves; 2 large sprig fresh rosemary; 1 cup uncooked orzo; 1 small bunch of fresh kale, roughly chopped (with tough stalks discarded); juice of 1 lemon; fine sea salt and freshly-cracked black pepper; freshly-grated Parmesan cheese, for topping (optional)