Greek Barley Salad

Name: Greek Barley Salad
Ingredients: 1/2 cup quick pearled barley; 12 cherry tomatoes, quartered; 1/2 English cucumber, quartered, sliced; 1 cup crumbled feta cheese; 1/4 red onion, diced (or to taste, depending on size of onion); 2 ounces Kalamata olives, well-drained, roughly chopped; 1/4 cup chopped flat-leaf parsley; 1 teaspoon dried Mediterranean oregano; 2 tablespoons Greek vinaigrette, or to taste; 1 tablespoon red wine vinegar, or to taste; Salt and pepper to taste