Begin by popping open the amaranth seeds first. To do this, heat a pan with a glass lid on medium heat. Throw in a few seeds to check for the right temperature.
Once it's reached the right temperature for popping, work in batches, adding one tablespoon at a time, and pop the amaranth seeds. Transfer them out into a bowl when they stop popping. Keep an eye on the ones you add because they have a tendency to burn.
Next, break the piloncillo bars into the same saucepan, add the honey and water and warm the mixture, stirring, until fully dissolved. Set aside to cool.
Add the pop amaranth to the syrup and stir until all the amaranth seeds are covered.
Oil a baking tray add the amaranth/syrup mixture and press down with a rolling pin until evenly spread in the tray.
Leave it to cool for a couple of hours. Once hardened cut into whatever shapes you like and serve