Bring about 1 litre of salted water to the boil. Add vinegar essence. Beat the eggs one by one in a ladle lightly coated with oil and let them slide into the water. Cook at low heat for about 5 minutes. Lightly fold over the ham slices 2 times. Fry briefly in 1 tablespoon of hot butter and place on 1 slice of bread.
For the sauce heat 1/8 litre of water. Stir in the contents of the bag with a whisk, bring to the boil. Cut 125 g butter into small pieces and fold them in over a low heat. Spread 1 poached egg and some sauce on each loaf of bread. Wash the chives, cut into small rolls and sprinkle over the bread. Serve garnished with parsley