Place trout in a single layer in a plastic bag or glass baking dish Combine the soy sauce ketchup lemon juice oil and rosemary
Pour into bag or dish
Cover or close bag and let stand for 1 hour turning once
Remove fish reserving marinade Place fish in a single layer in a well-greased hinged wire grill basket Grill covered over medium coals for 8 to 10 minutes or until fish is browned on the bottom Turn and baste with marinade Grill 5 to 7 minutes longer or until fish flakes easily with a fork