Three Cheese Crostini Appetizer

Name: Three Cheese Crostini Appetizer
Ingredients: 1 1/2 cups quartered cherry tomatoes; 3 tablespoons thinly sliced shallots; 2 1/2 tablespoons extra-virgin olive oil, divided; 1/2 tablespoon balsamic vinegar; 3/4 cup ricotta cheese; 1/4 cup crumbled blue cheese, loosely measured; 1/4 cup prepared basil pesto; 3/4 teaspoon salt, divided; 1 teaspoon fresh lemon juice; 1 teaspoon grated lemon peel, loosely measured; 16 slices French or artisan type baguette, cut 1/4-inch thick on the diagonal; 2 to 3 grinds black peppercorns (using handheld grinder); 3 tablespoons finely chopped fresh basil leaves; 1/4 cup finely shredded fresh Pecorino Romano cheese, loosely measured