Step 1

Cook pasta according to package directions. Drain and rinse pasta under cold running water; drain well.

Step 2

While pasta cooks, stir together feta, buttermilk, mayonnaise, hot sauce, lemon zest and juice, salt, garlic, and black pepper in a medium bowl.

Step 3

Transfer pasta to a large serving bowl. Add buttermilk dressing, torn herbs, celery, tomatoes, red onion, and sunflower seeds, and toss well.