Leave the bacon in a pan without fat until crispy. Bring about 3 litres of water to the boil in a saucepan. Season with vinegar. Beat the eggs one after the other into a cup and let them glide one by one into the boiling water. Cook for approx. 4 minutes while boiling, carefully pressing the egg white with tablespoons against the egg yolk. Drain on kitchen paper.
Halve the toasties and toast them. Warm up the sauce hollandaise in a small pot. Place the toasties on a baking tray lined with baking paper. Place bacon on the toasties, place eggs on top and drizzle with the sauce. Bake in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) for approx. 4 minutes. Wash the chives, shake dry and cut into fine rolls. Sprinkle eggs with coarse pepper and chives.