Bloom the gelatin in the water. Melt over a warm—not hot—water bath; heat just enough to dissolve the gelatin so that it is not hot, just melted.
Combine with the confectioners’ sugar and peppermint extract, mixing to obtain a doughlike mass. You may want to add more extract since the flavor tends to dissipate when the lozenge dries. It is up to personal taste, but it is better to overcompensate for this fact. You may also replace the peppermint with other flavors, but they may taste too artificial. Peppermint is an extract that people are accustomed to tasting in its artificial form.
Roll out the dough as thin as possible using a pasta machine.
Cut the dough into 2.5-cm/1-in squares.
Allow to air-dry for at least 24 hours, or dry in a dehydrator set to 50°C/122°F for at least 2 hours.
Once dry, you may apply a graphic image to the surface by using a rubber stamp and natural food coloring in a sponge pad.