for a great extraction method check out stinky's "clean cannabutter tutorial" in the medical edibles forum.

Yesterday I made 1.5-2tbsp of cannabutter using 36 grams of vaped cannabis and got super stoned. The best part was that you couldn't taste the weed let alone the burnt/scorched flavor of vaporized/used up weed.

It's a bit tedious but well worth it for the end product. YUM!