Shark in Spicy Tangerine Marinade

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 and freshly ground black pepper
Spicy Tangerine Marinade (see recipe below)

Spicy Tangerine Marinade

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

Prepare the Spicy Tangerine marinade by mixing all the ingredients together. Marinate thresher shark in the Spicy Tangerine marinade for at least 2 hours.

Cook Shark on preheated barbecue grill for about 5 minutes per side. Let Thresher Shark rest for 2 minutes covered loosely with foil. Place the remaining marinade in a small sauce pan, add orange juice and place on the grill, cook until it comes to a boil, set aside. Place the grilled thresher shark on individual plates, top with the spicy tangerine sauce and serve with fresh spinach and grilled yams.