Pasta Salad with Feta and Herbs

Name: Pasta Salad with Feta and Herbs
Ingredients: 1 pound uncooked penne pasta; 5 ounces feta cheese, crumbled (about 1 1/4 cups); 1/2 cup buttermilk; 1/4 cup mayonnaise (such as Duke’s); 2 tablespoons Louisiana-style hot sauce (such as Crystal); 1 tablespoon grated lemon zest plus 1/4 cup fresh lemon juice (from 2 lemons); 1 1/2 teaspoons kosher salt; 1 teaspoon grated garlic; 1/2 teaspoon black pepper; 4 cups torn mixed tender fresh herbs (such as basil, mint, dill, and chives); 1 1/2 cups thinly sliced celery; 1 cup cherry tomatoes, halved; 1/2 red onion, cut in half lengthwise and thinly sliced (about 1 cup); 3/4 cup salted roasted sunflower seed kernels