Grilled Tuna and Watercress Salad with Asian Flavors Recipe

Ingredients

• 1/3 cup extra-virgin olive oil
• 1 tablespoon Asian sesame oil
• 1 tablespoon soy sauce
• 6 tablespoons rice vinegar (not seasoned)
• 2 tablespoons minced peeled ginger
• 2 tablespoons coriander seeds, coarsely crushed
• 2 tablespoons white peppercorns, coarsely crushed
• 1 tablespoon kosher salt
• 1 tablespoon vegetable oil
• 1 (1-pound) sushi-grade tuna steak (about 2 inches thick)
• 1 pound jicama, peeled
• 2 bunches watercress (10 ounces), tough stems discarded
• 2 scallions, very thinly sliced