Root Vegetable Soup

Name: Root Vegetable Soup
Ingredients: 1 Tablespoon/15ml extra-virgin olive oil (plus more for fried sage leaves); 1 large or 2 small shallots, finely chopped; 3 garlic cloves, finely chopped; ½ a large or 1 small fennel bulb, finely chopped; 3 celery stalks, finely diced; 1-inch piece of fresh turmeric, peeled and grated on a microplane; 1 bay leaf; 1 medium parsnip, finely diced; 3 carrots, finely diced; ½ a large turnip, finely diced; ½ a large potato or Japanese sweet potato, peeled and finely diced; 1 teaspoon fine sea salt; ¼ teaspoon freshly ground black pepper; 4 cups/960ml filtered water; Small bunch of fresh sage leaves for frying (optional)