Name: 64 Degree Egg Recipe
Yield: makes as many as needed
Ingredients: 1 tablespoon dijon mustard, or to taste; 4 thin slices prosciutto; 1/2-3/4 cup shredded gruyère; 2 english muffins, split; 1-2 tablespoons butter, at room temperature; 2 slow poached eggs or 64°C eggs (see below); hollandaise sauce, as needed; chives, to garnish; freshly ground pepper; 2 egg yolks; 4 tablespoons (1/2 stick) cold butter cut into cubes; 1 tablespoon water; squeeze of lemon, to taste; eggs, as needed