Ingredients

1/2 cup packed parsley leaves

1 to 2 anchovy fillets

1 scallion, coarsely chopped

1/2 small garlic clove

1/4 cup light mayonnaise

1/4 cup plain low-fat yogurt

1 tablespoon white-wine vinegar

Coarse salt and ground pepper

1 pound large shrimp

Oil, for grates

Preparation

For the sauce, in a food processor, pulse parsley, anchovies, scallion, and garlic until scallion and parsley are finely chopped. Add mayonnaise, yogurt, and vinegar; pulse until combined. Season with salt and pepper.

For the shrimp, heat the grill to medium high; lightly oil grates. Peel and devein shrimp. Thread shrimp horizontally onto five 12-inch-long skewers. Grill, turning skewers over once, until shrimp are opaque throughout, 4 to 6 minutes. Remove from skewers, and if desired, serve over watercress with lemon wedges