Ingredients
- 1/4 cup walnut halves or pieces
- 1 ounce Parmesan cheese (1/2 cup firmly packed freshly grated or 1/3 cup store-bought grated), plus more for serving
- 1/2 medium bunch fresh parsley
- 1 clove garlic
- 1 (8.5-ounce) jar sun-dried tomatoes packed in oil
- 1/4 teaspoon balsamic vinegar
- 1/4 teaspoon kosher salt
- 1 pound dried penne pasta
- Red pepper flakes, for serving (optional)
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