Greek Quinoa Salad

Name: Greek Quinoa Salad
Ingredients: 1 1/4 cups quinoa, rinsed; Kosher salt; 1 15-ounce can chickpeas, drained and rinsed; 1/2 seedless cucumber, chopped; 3 large plum or 5 Campari tomatoes, chopped; 1/2 red onion, thinly sliced; 3 tablespoons red wine vinegar; 3 tablespoons extra-virgin olive oil; 1 tablespoon finely chopped fresh oregano, plus more for topping; Freshly ground pepper; 1/4 cup crumbled feta cheese (about 2 ounces); 1 small head romaine lettuce, chopped; 1/4 cup halved pitted kalamata olives