Pasta with Tomato, Onion and Butter

Name: Pasta with Tomato, Onion and Butter
Cook time: 35 min
Total time: 35 min
Ingredients: 1 pound spaghetti; Kosher salt and ground black pepper; 4 tablespoons salted butter, cut into 1-tablespoon pieces, divided; 1 small yellow onion, chopped; 1 6-ounce can tomato paste; 1 tablespoon balsamic vinegar OR white balsamic vinegar; 1 ounce Parmesan cheese, finely grated (½ cup), plus more to serve; Optional garnish: Chopped fresh basil

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Cook Time: 35 minutes

Total: 35 minutes

Servings: 5

Ingredients

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1 pound spaghettiKosher salt and ground black pepper4 tablespoons salted butter, cut into 1-tablespoon pieces, divided1 small yellow onion, chopped1 6-ounce can tomato paste1 tablespoon balsamic vinegar OR white balsamic vinegar1 ounce Parmesan cheese, finely grated (½ cup), plus more to serveOptional garnish: Chopped fresh basil

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Instructions

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Step 1

In a large pot, bring 4 quarts water to a boil. Add the pasta and 1 tablespoon salt, then cook, stirring occasionally, until al dente. Reserve 2 cups of the cooking water, then drain; set aside.

Step 2

In the same pot over medium, melt 2 tablespoons butter. Add the onion, reduce to low, cover and cook, stirring occasionally, until the onion has softened, 12 to 14 minutes.

Step 3

Add the tomato paste, ½ teaspoon pepper and 1½ cups of the reserved cooking water, then whisk until smooth. Add the pasta, the remaining 2 tablespoons butter and the vinegar. Using tongs, toss until the sauce clings to the pasta, the pasta is heated through and the butter is melted, adding more cooking water if needed so the noodles are lightly sauced.

Step 4

Off heat, toss in the Parmesan, then taste and season with salt and pepper. Serve sprinkled with additional Parmesan.