Pineapple Polenta Squares with Shrimp

Name: Pineapple Polenta Squares with Shrimp
Ingredients: 2 cups low-sodium chicken broth or water; 1/2 cup polenta; Kosher salt and freshly ground pepper; 2 tablespoons chopped fresh sage; 1/2 cup finely chopped fresh pineapple; Vegetable oil, for brushing; 1/2 cup chopped fresh pineapple; 12 large shrimp, peeled and deveined; 1/4 cup extra-virgin olive oil; 2 cloves garlic, minced; 1/2 teaspoon red pepper flakes; 6 thin slices prosciutto, halved lengthwise; 1 stick unsalted butter, cut into pieces; 1/4 cup finely chopped fresh pineapple; Chopped fresh parsley, for garnish