Preheat oven to 400°F.
In a small skillet, cook bacon until almost crisp. Using a slotted spoon, remove from skillet to a paper towel-lined plate. Set aside.
Place butter, shallots, bell pepper, celery, lemon juice, Worcestershire sauce and cayenne pepper in a food processor. Pulse until well combined, about 20 seconds.
Spread 1/4 inch rock salt on a rimmed baking sheet.
Place sheet in oven and bake for 8 minutes.
Place oysters firmly in the hot rock salt. Be careful not to burn yourself and not to spill the juice from the shells.
Place 1 tablespoon of the butter mixture on each oyster.
Top each with a sprinkling of bacon.
Place sheet back in oven and bake oysters until bubbly, about 12 minutes. Do not overcook.
Sprinkle with parsley and serve immediately.