In a medium bowl mix the marinade ingredients. Set aside 120 milliliters of the marinade to use as a dressing for the salad.
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Mincing Garlic
Place the shrimp in a large, resealable plastic bag and pour in the marinade. Press the air out of the bag and seal tightly. Turn the bag several times to distribute the marinade, place the bag flat on a plate, and refrigerate for 1 hour.
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Peeling and Deveining Shrimp (Tails Left On)
Prepare the grill for direct cooking over high heat (230° to 290°C) and preheat the grill pan for about 10 minutes.
Prepare the grill for cooking over high heat (260°C) and preheat the grill pan for about 10 minutes.
Drain the shrimp in a fine-mesh sieve. Spread the shrimp in a single layer on the grill pan and cook over direct high heat, with the lid closed, until slightly firm on the surface and completely opaque in the center, 2 to 4 minutes, shaking the pan once or twice and turning the shrimp over for even cooking. Remove the pan from the grill and put the shrimp in a large bowl to stop the cooking.
Drain the shrimp in a fine-mesh sieve. Spread the shrimp in a single layer on the grill pan and cook over high heat, with the lid closed, until slightly firm on the surface and completely opaque in the center, 2 to 4 minutes, shaking the pan once or twice and turning the shrimp over for even cooking. Remove the pan from the grill and put the shrimp in a large bowl to stop the cooking.
Add the watercress to the large bowl with the shrimp. Spoon the reserved dressing over the watercress and shrimp (you may not need all of it). Toss to coat the ingredients evenly. Serve right away.