BBQ Shrimp with Fried Polenta Cakes

Name: BBQ Shrimp with Fried Polenta Cakes
Ingredients: 5 tablespoons unsalted butter, divided; 2 cloves garlic, minced; 2 tablespoons chili sauce (found in the ketchup aisle); 3 tablespoons Worcesterhire sauce; 1/2 teaspoon liquid smoke; 2 tablespoons fresh-squeezed lemon juice; 1 teaspoon Cajun (Creole) seasoning; Pinch of cayenne pepper; 1 teaspoon Sriracha sauce; 1 teaspoon Tabasco sauce; 1 teaspoon dried oregano; 1 tablespoon fresh parsley, chopped; Generous amounts of ground black pepper, to taste; 1/2 pound jumbo shrimp, peeled and deveined; Prepared refrigerated polenta (comes in a tube); Chopped parsley and green onion, for garnish