Prepare grill for direct-heat cooking over medium-hot charcoal (medium-high heat for gas); see Grilling Procedure.
Stir together oil, oregano, and 3/4 teaspoon each of salt and pepper in a bowl.
Cut onion lengthwise into 3/4-inch wedges and separate layers. Toss shrimp and onion with oil mixture, then thread 6 shrimp onto each skewer, alternating with single layers of onion.
Grill shrimp, covered only if using a gas grill, turning once, until just cooked through, 3 to 4 minutes total.
Shrimp can be cooked in a hot lightly oiled large (2-burner) ridged grill pan, about 6 minutes.
Per serving: 173 calories, 14g fat (2g saturated), 64mg cholesterol, 499mg sodium, 3g carbohydrates, 1g fiber, 9g protein
Nutrition Data
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