Pasta and Bean Picnic Salad

Name: Pasta and Bean Picnic Salad
Ingredients: 3 teaspoons salt; 1 pound small-shaped pasta (curly, twisted, corkscrew, shells, or bow-ties); 7 tablespoons olive oil , divided; 2 cans (15-to 16-ounces each) white beans, like Great Northern, navy, or cannellini , drained and rinsed; Zest from 1 lemon; 2 tablespoons apple cider vinegar; 1 heaping teaspoon Dijon mustard; 1/4 teaspoon ground black pepper; 1 pint mixed cherry or grape tomatoes, sliced or cut into quarters; 2 stalks celery , halved lengthwise and very thinly sliced; 1/2 red onion , very thinly sliced; 1/4 cup chopped fresh parsley