Ingredient:

• ⅓ cup butter
• 1 teaspoon olive oil
• 1 onion, minced
• ⅓ cup all-purpose flour
• 1 quart half-and-half, or as needed
• 2 cups bar clams, drained with juice reserved
• ⅓ cup grated Parmigiano-Reggiano cheese
• 2 potatoes, cubed
• 2 cups cream-style corn
• 1 large ear corn, kernels cut from the cob
• 1 cup sliced cherry tomatoes
• 1 ½ cups water, or as needed
• sea salt and coarsely ground black pepper to taste
• 1 fresh haddock fillet, cut into 1-inch pieces
• 2 cups large shrimp, peeled and deveined
• 1 cup canned lobster meat, with juice