How to Make It
Heat Instant Pot on Sauté setting. Heat 2 tablespoons of the oil and 1 tablespoon of the butter until melted. Add leeks, and cook, stirring often until softened, about 5 minutes. Add garlic, and cook 1 minute. Stir in rice and thyme; cook, stirring often until coated, about 1 minute. Pour in wine, and cook until slightly reduced, 2 to 3 minutes. Stir in broth, 1 teaspoon of the salt, and 1/2 teaspoon of the pepper until combined. Press “Cancel”, and secure lid on pot. Set to High Pressure setting for 7 minutes.
While risotto cooks, prepare scallops. Pat scallops dry with a paper towel, and sprinkle with remaining 1 teaspoon salt and 1/2 teaspoon pepper. Heat remaining 1 tablespoon oil in large skillet over high. Add scallops to hot oil, and cook undisturbed until golden brown, about 2 minutes. Flip and cook until cooked through, 1 to 2 more minutes.
When pressure cooking is complete, carefully release the pressure. Carefully remove lid, and stir well until creamy. Stir in cheese, zest, juice, and remaining 2 tablespoons butter until combined. Divide risotto among 4 shallow bowls. Top each with 3 seared scallops, and sprinkle with tarragon.