For the meringue base, preheat the oven (electric oven: 100 °C/circulating air: 75 °C/gas: see manufacturer). Line a baking tray with baking paper. Beat the egg white until stiff, gradually adding sugar and 1 pinch of salt.
Continue beating until the sugar has dissolved and the mixture is shiny. Finally stir in lemon juice.
Cut the marzipan bars into about 24 pieces. Pour the egg whites into a piping bag with a large perforated spout. Spray half of the mixture as approx. 24 small flat spots on the tray. Place 1 piece of marzipan on each.
Spray the remaining mass as tuff onto it.
Leave to dry in a hot oven for about 2 hours. Take out and let cool down.