White Osso Buco with Elderflower and Tarragon

Name: White Osso Buco with Elderflower and Tarragon
Ingredients: 6-8 pieces veal (or beef) shin (osso buco); 6 Tablespoons all-purpose flour; 2 Tablespoons extra virgin olive oil; 3 1/2 Tablespoons butter; 2 celery stalks; 5 garlic cloves, chopped; 3 bay leaves; 1/2 Cup dry white wine; 2 Cups water; 2 shallots, chopped; 7 Ounces parsley root; 3/4 Cups elderflower cordial; 10 tarragon sprigs; sea salt and ground black pepper