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1. Bring a large pot of well-salted water to a boil and cook the spaghetti until just shy of al dente according to package directions.
9 oz spaghetti,
1 tsp salt
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2. Before draining, scoop out some pasta cooking water and reserve it, then drain the spaghetti and set aside.
0.8 cup pasta cooking water
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3. While the pasta cooks, finely mince the garlic, thinly slice the jalapeño, finely chop the parsley, finely slice the chives, and cut the lemon into wedges.
5 clove garlic,
3 piece jalapeño,
0.5 cup fresh parsley,
0.2 cup fresh chives,
0.5 piece lemon
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4. In a large skillet over medium heat, warm the olive oil and melt the butter until foamy but not browned.
6 tbsp unsalted butter,
1 tbsp olive oil
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5. Add the sliced jalapeño to the skillet and sauté, stirring frequently, until slightly softened and fragrant.
3 piece jalapeño
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6. Stir in the minced garlic and red pepper flakes and cook briefly, stirring constantly, until the garlic is just turning pale golden and very fragrant.
5 clove garlic,
0.2 tsp red pepper flakes
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7. Add the drained spaghetti to the skillet and toss well to coat it in the garlic butter and jalapeños.
9 oz spaghetti
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8. Pour in some of the reserved pasta cooking water and continue tossing over medium heat until the liquid emulsifies with the butter and lightly coats the spaghetti in a glossy sauce.
6 tbsp unsalted butter,
0.8 cup pasta cooking water
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9. Lower the heat, sprinkle in the Parmesan cheese, and toss until it melts smoothly into the sauce, loosening with a splash more pasta water if needed.
0.8 cup Parmesan cheese,
0.8 cup pasta cooking water
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10. Season with salt and black pepper to taste, then fold in most of the parsley and chives, reserving a little for garnish.
0.5 cup fresh parsley,
0.2 cup fresh chives,
1 tsp salt,
0.5 tsp black pepper
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11. Plate the spaghetti, top with the remaining herbs and extra Parmesan cheese, and serve with lemon wedges for squeezing over just before eating.
0.2 cup fresh parsley,
0.1 cup fresh chives,
0.5 piece lemon,
0.2 cup extra Parmesan cheese (garnish)