Here's a method buddies and I use:
Tools required:
1 pot
1 strainer, plastic/metallic type with mesh, big enough to cover the pot (not the dope silly!)
1 250g block of butter, cut into 50g blocks
Water to fill the pot
Method:
Put water in pot and turn on heat. Get your leaf, kiff whatever you want to call it (add in a few buds for extra strength dope-butter!) and stick all in the pot. Wait until water begins to boil a little. Put strainer over the boiling mixture and press down (hopefully you've got enough green to have the need to press down and feel resistance). Next add in the butter INSIDE the strainer (you can put all of it or at least 50%) and keep the mixture simmering for 2 hours (at least, probably better around 3). The THC will dissolve into the water and be soaked up by teh butter. Take pot away from heat and allow to cool completely. Now all you have to to is remove the butter from inside the strainer.
Hopefully you had a fair bit of green that the soggy stuff will stick to the OUTSIDE of the strainer, be carefeul when 'scraping' this from the outside. This should happen if you had that 'resistance' thing when you pushed the strainer against the green mixture that was in the pot. This also creates a sort of seal when you throw in the butter -> it won't escape from the 'pool' of liquid INSIDE the stainer.
Now you can use the butter for those lovely chocolate cakes and muffins!
ENJOY!
BTW, there is another method but you need a stocking. Place the green INSIDE the stocking and then tie a knot in it. Put this inside the boiling water and add the butter. A bit more messy in a sense and more likely to have the butter get inside teh stocking.
Happy cooking!