Bring wok back up to very hot over high heat. Add 1 Tbs oil, tilt & coat. Add black beans, chilies, garlic & green onion pieces & stir fry all for 1 minute. Add broth/stock and heat to boiling. Stir in cornstarch/sugar water mixture, stir cooking until thickened. Add fish steaks turning to coat with sauce. Heat 2 minutes. Line platter with spinach/lettuce leaves, place fish on bed and garnish top with green onion slivers.