1. Mix 2 tablespoons wasabi powder and 1 1/2 tablespoons water in small bowl to blend. Whisk in 1/2 cup mayonnaise. Cover wasabi mayonnaise and refrigerate at least 30 minutes. (Can be made 1 day ahead. Keep refrigerated.) 2. Combine tuna and soy sauce in medium bowl; toss to coat. Marinate tuna 30 minutes at room temperature, stirring occasionally. 3. Meanwhile, thread 1 ginger slice onto each skewer 2 inches from tip. 4. Line platter with watercress. Place bowl of wasabi mayonnaise on platter. Drain tuna; pat dry. Return to medium bowl. Sprinkle with pepper; toss to coat. Heat oil in large skillet over medium-high heat. Add tuna and sear until browned on all sides but still pink inside, about 2 minutes total. Thread 1 tuna cube onto each prepared skewer next to ginger. Arrange skewers on platter and serve. ---------------------------------------------------------------------------
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