1 to 1. Sticks of butter in the states usually weigh around 4 ozs. A box of butter usually carries around 4 sticks. 16 ozs of butter to 16 ozs of weed trim. I never really "Weighed" how much I was putting in so 1 to 1 may be a bit much but it was pretty close!
@CannaGranny mentioned her recipe uses an ounce for every pound of butter. Probably why the first batch I sold to a dispensary sold out the same day!!!
I had forgotten that I was making this for sale and not personal consumption so I printed up custom butter wrappers from parchment paper on my inkjet printer with a comical devil face and "XXX" on the wrapper and delivered it to the dispensary. Dispensary called me the afternoon of the morning I had delivered them and wanted to reorder. He told me someone had come in and bought a stick then came back a few hours later and bought all the rest.
At the time I was brokering bales of trim to extractors through some of the connections I had to some of the NorCal farms so trim wasn't hard for me to come by. I used to sell 5 lb bags of trim to local edible bakers that made their own infused oils also.
As
@MiGrampa mentioned, it helps from scorching the butter but I feel it's most useful after I get it in the freezer. Most of the solids that are suspended in the butter after it's been filtered will sink to the bottom of the butter floating on top of the ice. When I separate the butter from the ice I can scrape off the solids and get a pretty clean consistent butter without bits of plant material in it. After I've strained it into the glass bowl, I usually let it sit on the counter for a few hours to cool and allow the solids to sink to the water. If I stuck it in the freezer immediately it would solidify the butter too fast and any solids would stay suspended in the butter.
I also don't try and squeeze out the cheesecloth to try and extract every bit of butter. I noticed it imparts this weird grassy flavor if I do that.