Gingered Beef Burgers

Ingredients

• 1 jicama
• 1 large sweet onion
• 2 teaspoons mirin (Japanese sweet rice wine for cooking)
• 2 teaspoons soy sauce
• 1 pound ground beef
• 4 teaspoons very finely chopped Australian crystallized ginger
• 1/4 cup Sutter Home White Zinfandel
• 1 tablespoon soy sauce
• 2 teaspoons mirin
• 1/2 teaspoon onion salt
• 1/2 teaspoon garlic salt
• 1/2 teaspoon freshly ground black pepper
• Vegetable oil, for brushing on the grill rack
• 4 seeded sandwich rolls, split
• 1/2 cup butter, softened