Fill a medium saucepan with water and add the white vinegar; bring to a very gentle simmer over medium-low heat.
In a small heat-proof glass bowl, whisk the single egg yolk and lemon juice together until the mixture becomes slightly thickened and pale.
Place the bowl over the pot of simmering water, ensuring the bottom doesn't touch the water, and slowly whisk in the melted ghee until the sauce is thick and emulsified.
Whisk in the sea salt and black pepper into the hollandaise, then remove from heat and cover to keep warm.
Crack each of the two large eggs into individual small ramekins.
Use a spoon to create a gentle whirlpool in the simmering water and carefully drop each egg into the center; poach for 3 minutes until whites are set but yolks remain soft.
While the eggs poach, sear the Canadian bacon in a dry skillet over medium-high heat for 1-2 minutes per side until golden and toast the English muffin half.
Place the toasted muffin half on a plate, layer with the seared Canadian bacon slices, and carefully top with the poached eggs using a slotted spoon.
Drizzle the warm hollandaise sauce generously over the eggs and garnish with finely chopped fresh chives.