01 -
Bring a medium pot of water with 1 teaspoon salt to a boil. Add fresh basil and stir for 10 seconds. Transfer immediately to a bowl of ice water. After 2–3 minutes, drain and press out moisture using paper towels.
02 -
In a food processor, combine blanched basil, Parmesan, pine nuts, and garlic. Pulse for 20–30 seconds until combined. With the processor running, slowly pour in the olive oil until smooth.
03 -
Bring a large pot of water with 2 teaspoons salt to a boil. Cook pasta according to package directions. Reserve 1/4 cup of pasta water before draining.
04 -
Return pasta to the pot. Add half the pesto, melted butter, and half the reserved pasta water. Toss with tongs to coat. Adjust with more pesto and water if desired. Serve immediately topped with additional Parmesan.