Classic Greek Salad

Name: Classic Greek Salad
Ingredients: 3 teaspoons red wine vinegar; 1 tablespoon freshly squeezed lemon juice; 1 teaspoon dried oregano; Kosher salt and freshly ground black pepper; 1/4 cup extra-virgin olive oil; 8 large leaves red leaf lettuce, sliced crosswise; 1/4 large red onion, thinly sliced; 1/2 green bell pepper, cut into large dice; 1 vine-ripened tomato, cut into wedges; 1/2 English cucumber, halved lengthwise, cut into 1/2-inch pieces; 6 Kalamata olives; 2 ounces feta cheese, crumbled