Grilled Seafood Brochette With Orange-Tarragon Vinaigrette
["1 Tbsp. orange juice", "1/2 Tbsp. chopped, fresh tarragon or 1/2 tsp. dried", "1 tsp. Dijon mustard", "1/8 tsp. sugar", "1/8 tsp. grated, fresh orange rind", "1/8 tsp. grated, fresh ginger or pinch of dried", "1/8 tsp. salt", "1/8 tsp. pepper", "3 Tbsp. olive oil", "16 large, raw shrimp (about 24 to the lb.), peeled and deveined", "12 sea scallops", "4 orange slices (optional)", "4 sprigs tarragon (optional)"]
["To make vinaigrette, combine the orange juice and the next 7 ingredients.", "Beat in oil; reserve."]
["orange juice", "tarragon", "mustard", "sugar", "orange rind", "fresh ginger", "salt", "pepper", "olive oil", "shrimp", "scallops", "orange slices", "tarragon"]