Slice the tofu into 1 inch cubes and place in a large ziplock bag or a small flat container (like a tupperware). (spiceandsprout.com)
Flat containers like Tupperware or Gladware allow to place the pieces side by side, rather than stacking them, and potentially have them stick together. (fieryfoodscentral.com)
In a large flat container (I use a Tupperware container) mix the coconut oil with the cocoa powder and sweetener until smooth. (ditchthewheat.com)