Spicy Lobster Pasta

Ingredients

• 12 ounces spaghetti
• Kosher salt
• 2 tablespoons olive oil
• 2 tablespoons unsalted butter
• 1 large shallot, finely chopped
• 1 teaspoon crushed red pepper flakes
• 1 pound cherry and/or Sun Gold tomatoes, halved
• Freshly ground black pepper
• 1 teaspoon finely grated lemon zest