Shrimp-and-Orzo Salad with Greek Flavors

INGREDIENTS

• 1/2 pound orzo (about 1 cup)
• 1 pound large shrimp, shelled and halved lengthwise
• 1 tablespoon lemon juice
• 1 tablespoon red- or white-wine vinegar
• 1/4 teaspoon salt
• 1/4 teaspoon fresh-ground black pepper
• 1 tablespoon chopped fresh oregano, or 1 teaspoon dried oregano
• 1/3 cup olive oil
• 4 scallions including green tops, chopped
• 1/2 cup pitted and chopped black olives, such as Kalamata
• 1/4 pound feta, crumbled