This recipe for oysters casino is from "The Hog Island Oyster Cookbook" by Jairemarie Pomo.
Preheat oven to 400 degrees. In a small skillet, cook bacon until almost crisp. Using a slotted spoon, transfer to a paper towel-lined plate; set aside.
Place the butter, shallots, bell pepper, celery, lemon juice, Worcestershire sauce, and cayenne pepper in a food processor; mix until well combined, about 20 seconds.
Spread 1/4 inch rock salt on a rimmed baking sheet and bake for 8 minutes.
Place oysters firmly in the hot rock salt. Place 1 tablespoon of the butter mixture on each oyster; top each with bacon. Bake oysters until bubbly, about 12 minutes. Do not overcook. Sprinkle with parsley and serve immediately.