Marinated Chickpea and Feta Salad with Spring Veggies

Name: Marinated Chickpea and Feta Salad with Spring Veggies
Ingredients: 1/2 cup farro; 6 cups water; 2 1/4 teaspoons kosher salt, divided, plus more as needed; 1/4 cup extra-virgin olive oil; 2 tablespoons red wine vinegar; 1 medium lemon; 2 teaspoons dried oregano; Freshly ground black pepper; 1 small shallot; 1 clove garlic; 4 ounces feta cheese; 1 (15-ounce) can chickpeas; 6 small radishes; 4 ounces sugar snap peas; 1 medium avocado; 1/4 cup loosely packed fresh dill; 1 large or 2 small romaine lettuce hearts