Step 1

Add the butter, olive oil and garlic to a 6- or 8-quart Instant Pot® multi-cooker and set to high saute (see Cook's Note). Cook, stirring often, until the garlic is softened but not browned, about 3 minutes. Add the wine, lemon juice and zest, red pepper flakes, 2 teaspoons salt and several grinds of pepper. Bring to a boil and let simmer 1 minute. Add 2 cups water, then add half of the pasta all in one direction and then the other half of the pasta in a criss-cross fashion. Top with the shrimp and half of the scallions.

Step 2

Follow the manufacturer's guide for locking the lid and preparing to cook. Set to pressure cook on high for 1 minute. After the pressure-cook cycle is complete, follow the manufacturer's guide for natural release. After 5 minutes, being careful of any remaining steam, unlock and remove the lid.

Step 3

Using tongs, toss the pasta to evenly coat with the sauce and break up any clumps. Top with the remaining scallions and serve with salad and garlic bread if using.