elbow spaghetti with tomato, onion, and butter

How To Make elbow spaghetti with tomato, onion, and butter

• Step 1
  Bring a pot of water to a boil and add the salt. Add the pasta and cook for about 15 minutes until the pasta is almost done. Drain over a bowl and reserve 2 cups of the pasta water.
• Step 2
  Place 1 Tbsp butter in a saucepan. Add the onion and saute for 5 minutes.
• Step 3
  Add the tomato paste and 1 1/2 cups of pasta water.
• Step 4
  Add the pasta and continue to cook until the pasta is covered with the sauce.
• Step 5
  Add the balsamic vinegar, remaining butter, and Parmesan cheese. Cook and stir for 3 more minutes. Use more of the pasta water if to dry.
• Step 6
  Serve garnished with basil and more Parmesan.
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