Shrimp and Grapefruit Spinach Salad

Click HERE for the recipe on Marthastewart.com
  • 3 pink grapefruit
  • 3 tablespoons wine vinegar
  • 2 teaspoons Dijon mustard
  • Salt and pepper
  • 1/2 cup plus 1 tablespoon vegetable oil
  • 1 1/2 pounds large shrimp, peeled and deveined
  • 1 1/2 pounds spinach, stems trimmed and leaves washed well (about 3 1/2 quarts)
  • 1/2 red onion, thinly sliced