Lobster risotto recipe

Name: Lobster risotto recipe
Ingredients: 1 whole lobster (1 ¼ to 1 ½ pounds), steamed; 1 small onion, chopped; 1 medium carrot, chopped; 1 stalk celery, chopped; 4 cloves garlic, 2 whole and 2 minced; 2 tablespoons tomato paste; 1 bay leaf; 3 teaspoons kosher salt, divided; 1 teaspoon whole black peppercorns; 5 to 6 cups water; 1 tablespoon olive oil; 3 tablespoons unsalted butter, divided; 1 small shallot, finely chopped; 1 ½ cups arborio rice; ½ cup dry white wine; ¼ teaspoon fresh ground black pepper; zest from 1 lemon; ¼ cup grated Parmesan cheese, divided