Purple Cauliflower Pasta

1 . Stage

Bring a large pot of lightly salted water to a boil; cook the rotini at a boil until tender yet firm to the bite, about 8 minutes; drain, reserving 1/2 cup cooking water.

2 . Stage

Heat a small skillet over medium-low heat. Place walnuts in the hot skillet; continually cook and stir walnuts until toasted and fragrant, 3 to 5 minutes. Remove from heat and chop walnuts.

3 . Stage

Heat olive oil in a pan over medium heat. Cook and stir garlic in hot oil until golden, 2 to 3 minutes. Remove garlic from pan and set aside.

4 . Stage

Cook and stir cauliflower and 1/2 teaspoon kosher salt in the same pan over medium-high heat, stirring occasionally, until cauliflower is tender, 8 to 10 minutes.

5 . Stage

Pour balsamic vinegar over cauliflower. Cook and stir cauliflower until balsamic vinegar has reduced, about 1 minute.

6 . Stage

Stir walnuts, cooked garlic, red pepper flakes, and rosemary into cauliflower mixture until well combined.

7 . Stage

Stir cooked rotini and reserved 1/2 cup cooking water into cauliflower mixture until well blended. Sprinkle 1/2 teaspoon kosher salt and Parmesan cheese over rotini and cauliflower mixture.