• 3/4 lb. thin spaghetti or capellini (angel-hair pasta)
Bring a 6- to 8-quart pot of salted water to a boil.
Meanwhile, heat 1 tablespoon oil in a large, heavy skillet over medium-high heat. Add the shrimp in a single layer and sauté, turning over once, until just cooked through, about 2 minutes. Transfer with a slotted spoon to a warm plate.
In the same skillet, add the remaining 1 teaspoon oil and the shallots and garlic and cook, stirring for 1 minute. Add the wine, salt, pepper and red pepper flakes, and cook over high heat, stirring occasionally, 1 minute. Add the lemon juice, zest and butter to skillet, stirring until melted, and stir in shrimp and parsley. Remove skillet from heat.
Cook pasta in boiling water until al dente. Reserve 1 cup pasta-cooking water, then drain pasta in a colander. Add pasta to the skillet with the shrimp mixture and toss to combine, adding some of the reserved cooking water, if necessary, to keep it moist. Serve immediately.