Shark in Spicy Tangerine Marinade

Ingredients

• 2 pounds shark, cut into four 8 ounces pieces
• 6 ounces orange juice
• 2 bunches fresh spinach, trimmed and washed
• 1 pound red garnet yams, peeled and sliced into disks, about 1/4-inch thick
• Kosher salt
• freshly ground black pepper
• Spicy Tangerine Marinade (see recipe below)
• 1 tablespoon grated tangerine or orange zest
• 1 tablespoon thin soy sauce
• 1 tablespoon dry sherry or Chinese rice wine
• 1 tablespoon flavorless cooking oil
• 1 tablespoon honey
• 2 teaspoons Asian chili sauce