1: Heat the butter or oil in a 10-inch cast-iron skillet over medium-high heat on your grill’s side burner or on the grill grate. Add the onion, bell pepper, and jalapenos and cook until browned, 3 minutes, stirring with a wooden spoon.
2: Stir in the pastrami and potatoes and continue cooking until the potatoes are browned, 3 to 5 minutes more.
3: Stir in the Worcestershire sauce and hot sauce and cook for 1 minute. Correct the seasoning, adding salt and pepper to taste: the hash should be highly seasoned. Serve the hash right in the skillet.
4: Meanwhile, in a second skillet, melt the butter or heat the olive oil over medium-high heat. When sizzling, crack in the eggs. Fry until cooked to taste, 2 minutes per side for yolks that are still a little runny (that’s how I like them), turning with a spatula. Slide the fried eggs on top of the hash. Sprinkle with chopped parsley and dig in.