Mix the butter, powdered sugar and egg white with the hand mixer. Stir in the liquid couverture. Add the flour and use the mixer to make a smooth dough. Use the piping bag or a plastic pastry syringe (not a pastry press) to squirt small, uniform cookies onto the baking sheet. Bake at 180 ° C for about 8 minutes.
After cooling, brush with currant jelly and always glue 2 together. Dip half into liquid couverture.