Grilled Portobello Caprese Salad

4 portobello mushroom caps
1 C. halved grape tomatoes
1 C. cubed fresh mozzarella
handful of fresh basil leaves, torn
2 Tbsp. + olive oil
salt and freshly ground pepper
balsamic vinegar

Mix tomatoes, mozzarella, and basil with  2 Tbsp. olive oil.
Brush both sides of mushroom caps with olive oil and lightly salt and pepper each side. Grill 5 min. or so per side until tender.
Spoon even amounts of tomato mixture into caps and drizzle with balsamic vinegar.