Ingredients

• 2 tablespoons extra-virgin olive oil
• 1 medium red onion, halved and thinly sliced
• 1 teaspoon red pepper flakes
• 3 jalapenos, halved, seeded, and thinly sliced lengthwise
• Zest and juice of 3 lemons
• 1/2 cup (1 stick) unsalted butter
• Coarse salt and freshly ground pepper
• 1 1/4 pounds Mario Batali's Fresh Fettuccine
• 1/2 cup freshly grated Pecorino Romano

Directions

1. Bring 6 quarts water to a boil in a large pot; season with salt.

2. Meanwhile, in a 10- to 12-inch skillet, heat olive oil over medium heat until almost smoking. Add onion and red pepper flakes; saute until translucent, 8 to 10 minutes. Add jalapenos; saute for 1 minute. Add zest and juice; bring to a boil, and boil for 1 minute. Remove from heat; stir in butter, and season with salt and pepper. Set aside.

3. Drop pasta into boiling water and cook until tender, 1 to 2 minutes. Drain.

4. Toss hot pasta into pan with lemon mixture; return to medium heat. Stir together gently. Add pecorino; toss quickly. Transfer to a warmed serving platter. Serve immediately.