What you'll need:
Heart shape mold
Gel food colouring
Add 1/2 cup of sugar, 3/4 tsp of water, and a bit of food colouring until it forms a paste.
Pack the sugar into the heart molds. Make sure to level the sugar so the hearts are flat. Now let it sit in the molds for about an hour.
Once your sugar hearts have been in the mold for about an hour, turn them over onto parchment paper. Let the sugar hearts sit untouched for a few more hours, giving them time to harden.
There you have it heart shaped sugar cubes.