A recipe that was forgotten by many in the 70s. My grandmother used to cook this way. Whisk milk with vinegar and get this masterpiece

Mix one tablespoon of milk with the egg yolk. Let the buns sit under the cling film for 20 minutes and then brush each bun with the milk-egg mixture. Bake at 180 degrees Celsius for 25 minutes. At this point, make the sauce by mixing soft cheese with condensed milk. When the buns have cooled, top with the prepared cream. This allows you to prepare incredibly tasty and fragrant German cheese rolls that will be an exquisite addition to any table.