How to Make It
Preheat oven to 450°.
Combine 2 teaspoons oil, 1 tablespoon lemon juice, and 1/8 teaspoon salt in a dish. Add shrimp; toss to coat. Set aside.
Heat 2 teaspoons oil in a nonstick skillet over medium heat. Add onion; sauté 2 minutes. Stir in beans, stock, and remaining 1/8 teaspoon salt; cook 3 minutes.
Arrange shrimp on a baking sheet; roast at 450° for 4 minutes.
Combine remaining 2 tablespoons oil, remaining 2 tablespoons lemon juice, rind, vinegar, mustard, and black pepper in a bowl. Pour half of oil mixture over beans; toss. Stir in mint. Divide evenly among 4 plates; sprinkle with feta. Arrange shrimp alongside. Top with remaining oil mixture.