Good-Cooking - Grilled Portobello and Roasted Garlic Cheesecake

Ingredients

• 1 (9-inch) disk focaccia bread
• 2 large portobello mushrooms
• 1 tomato, sliced
• 1 1/2 pounds cream cheese, softened
• 3 large eggs
• 1 (16 ounce) container sour cream
• 2 tablespoons cornstarch
• 1/2 cup roasted garlic cloves, see below
• 1 cup balsamic vinegar, optional topping
• Toasted pine nuts, optional topping
• Chopped basil, optional topping
• Grated fresh parmesan cheese, optional topping