Finely chop half of the pistachios. Knead 200 g marzipan with 100 g powdered sugar, rum and the chopped pistachios.
Knead the rest of the marzipan with the kirsch, the food color and 150 g powdered sugar.
Roll out both types of marzipan between cling film to form squares of the same size, approx. 1 cm thick.
Place the two marzipan plates on top of each other and press them down gently. Cut into approx. 2 cm squares and leave to dry on a wire rack for approx. 1 hour.
Melt the couverture and coat the cubes with it. Garnish with the remaining pistachios.