You could always use the spoon method if you have a lighter. Same idea as the microwave but instead you grind em down and put them in a spoon and keep a flame under it until you see it turn light golden brown and then just finish the final steps of the microwave method, freeze, chop, snort, and enjoy.
Edit..
Freezing is an option you can skip though if you cant get to a freezer, just takes longer to cool is all.