Place the prosciutto slices in a cold skillet and turn the heat to medium, cooking until they are golden and crispy, then set aside on a paper towel.
In a small heat-proof bowl, whisk together the Greek yogurt, melted ghee, lemon juice, turmeric, and sea salt until completely smooth.
Gently warm the yogurt mixture by placing the bowl over a pot of simmering water (double boiler method) for 2 minutes, whisking constantly to prevent curdling.
Fill a medium saucepan with water and the white vinegar, bringing it to a very gentle simmer.
Crack each egg into a small ramekin, create a gentle whirlpool in the water, and carefully drop the eggs in to poach for 3 minutes until the whites are set.
Split and toast the whole wheat English muffin until the edges are brown and crunchy.
Assemble by placing the crispy prosciutto on the toasted muffin halves, topping each with a poached egg.
Generously spoon the warm yogurt hollandaise over the eggs and finish with a dusting of fresh black pepper.