If you have access to leaf and stem, use that. Preferably, allow it to soak in the closest thing to pure grain alcohol you can find for up to two weeks in a sealed canister such as a coffee can [poke a few holes in the lid for the gasses to escape], but make sure you have at least two coffee filters supporting your shake at the bottom of the liqour so you can strain the remaining THC at the end of the two week period. Only put in enough liqour to cover the shake, the more liqour, the less concentration of THC.

For your best results, periodlically strain and change the coffee filters holding your shake and add liqour as needed, seeing as it does evaporate over time. When you strain, just make sure all your shake is inside the coffee filter and bundle that sucker up, hold it over your canister containing the already green liqour, and squeeze as much alcohol out of the shake as possible, then stick it in a new filter and put it back in.

I wouldn't reccomend letting it sit any less then two weeks. Be careful, strong green dragon WILL knock you off your ass.