Hollandaise Sauce: With the whisk on the immersion blender, blend egg yolks and salt and pepper for about new minute. In a small sauce pan, heat the lemon juice and the white wine vinegar to a simmer. Pour this into the egg yolks SLOWLY whilst the blender is running. In the same small sauce pan, melt the butter without stirring. Upon completion remove from heat and let stand for a few moments (this allows the milk solids to settle to the bottom). Carefully pour the clear yellow liquid into the egg yolk mixture in a thin slow trickle while the blender is running. This is how you get a thick, smooth buttery sauce! Sandwich: Poach the eggs, grill the bacon, and toast the muffins. Top each muffin with bacon and a poached egg. Pour the hollandaise sauce over egg. I serve at this time, however you can put them under a hot grill for 30 seconds prior to serving.