Chuck em all in a big bottle of spirit (vodka, bercardi etc.) The higher the % the better. Leave it in a dark place for anything longer than a month (the longer you leave it the better it gets). Drink in shots and you get mashed.

I did one with about half O of stems in a litre of vodka for 4 months, had about 6 shots before a night out, and man was I fucked. I did drink alot more alcohol during the night and finnished off with some spliffs. It was a wicked night.

Give it a go if you have the patience to wait for it.