Pour mixture into the center of the waffle iron. Close the waffle maker and let cook for 3-5 minutes or until waffle is golden brown and set. Remove from the waffle maker and set on a plate.
Poach the egg: Fill a large saucepan with about 4 inches of water. Bring to a simmer. Swirl the water in one direction and gently crack in the egg. Poach the egg until the whites are just cooked but the yolk is still soft and runny.
Make the hollandaise: Place the bacon fat in a medium-sized saucepan and melt over medium heat. Add the broth and bring to a simmer. Whisk the yolk in a large bowl. Then, while whisking vigorously, slowly add the bacon fat reduction in a very slow, steady stream. Season with salt to taste.
To serve, place waffle on a plate, then top with a poached egg and a drizzle of hollandaise.