#1. Do not boil your herb/stems. Simmer them cause boiling them can burn of the THC. Keep the heat down to where the butter is barely bubbling at all.
#2. I simmered mine for almost 3 hours and its some bomb-diggity butter. I recommend the same for everyone else

dude, if ya do that with your cannabutter you can spread it on toast and get high LoL Its some great stuff. And take all your leftover plantmatter, strain it out really good, wash it off then stick it in a bottle of 100proof or higher liquor and let it sit for a month or two. Or heat that up to speed the extraction process.