Orzo Skillet With Salmon, Peas, Dill and Feta

Ingredients

• 2 tablespoons olive oil
• 1 small yellow onion, diced (1 cup)
• 1 1/2 cups whole-grain orzo
• 1 cup low-sodium chicken broth
• 1 1/4 cups water, or more as needed
• 1/2 teaspoon kosher salt, divided
• 2 cups (2 ounces), lightly packed, chopped fresh spinach leaves
• 1 cup peas, fresh or frozen
• 3 tablespoons chopped fresh dill
• 3 tablespoons fresh lemon juice
• 1/4 teaspoon freshly ground black pepper
• 1 1/2 pounds skinless salmon fillet, cut into 1-inch chunks
• 1/2 cup (2 ounces) crumbled feta cheese