Grilled Tuna
Source:   Simply Perfect Grilling 1999 (Better Home and Gardens)

This recipe is simple and delicious.   I always use tuna, so the instructions are for tuna.   You can use swordfish, halibut, shark or salmon steak.

1 pound fresh tuna
2 teaspoons olive oil
2 teaspoons lemon juice
1/8 teaspoon salt
1/8 pepper
2 cloves garlic, minced
2 teaspoons snipped fresh rosemary
1 tablespoon drained capers, slightly crushed
fresh rosemary sprigs for garnish

Brush both sides of tuna with oil and lemon juice.   Sprinkle with salt and pepper.   Mix rosemary and garlic, rub onto tuna.   Grill on an oiled rack about 4-6 minutes per 1/2 of thickness.   Turn once halfway through grilling.   Top with capers and rosemary - serve.