Stuffed Portobello Mushrooms on the Grill

INGREDIENTS

2/3 cup

fresh tomatoes, chopped

1/2 cup

shredded part-skim mozzarella cheese

1 tsp

olive oil

1/2 tsp

finely chopped fresh rosemary (or 1/8 teaspoon dried rosemary)

1/8 tsp

ground black pepper

garlic clove, crushed

(5-6" diameter) portobello mushroom caps

2 tbsp

balsamic vinegar

1 tsp

low-sodium soy sauce

low fat cooking spray

2 tsp

fresh basil, chopped