INGREDIENTS FOR BURGERS: 1 1/4 lb. shrimp, tails removed, peeled, deveined 1/2 small red or green bell pepper, seeds and ribs removed, chopped 1 scallion, chopped 2 Tbsp. packed fresh parsley leaves 4 tsp. cornstarch 1/2 tsp. garlic powder 1/4 tsp. black pepper 1/2 tsp. hot sauce, plus more for serving Kosher salt 1 1/4 tsp. paprika, divided 1/2 tsp. cayenne pepper, divided 1/3 c. buttermilk 3/4 c. cornmeal Vegetable oil, for frying (about 2 c.) 4 brioche buns, split Shredded iceberg lettuce, tomato slices, and dill pickle slices, for serving