Mix all ingrediants, except fish, to make sauce. Mash ginger and garlic and leave in sauce. Add enough water to sauce to cover fish. Marinate fish for 2 to 3 hours. Prepare a foil pouch for each fish steak. Put steak in pouch and cover with extra sauce. Seal and bake 450 F for 30-45 minutes. Open top and place under broiler for 2 minutes to brown.