Sicilian Turkey Burger

Name: Sicilian Turkey Burger
Ingredients: 1 pound lean ground turkey; 3 tablespoons tomato paste; 3 tablespoons currants; 2 tablespoons capers; 1/2 teaspoon dried basil; 1/2 teaspoon crushed fennel seeds; 1/2 teaspoon salt; Vegetable oil cooking spray; 1/2 cup grated Parmesan; 4 ciabatta rolls, split; 4 teaspoons balsamic vinegar; Sliced tomato (optional)