Just did a successful batch of super brownies.
I had cleaned my vape whip with a half pint of grain alcohol, and used the same alcohol to extract from about 1 oz of well used herb. Result: about 1/2 cup of deep golden fluid that we've had on hand for over a month waiting for the right situation.
I took a fresh ounce of duff (oxymoron, but you know what I mean) and ground it fine in a mortar, and added 3/4 cup of oil (peanut, because 1) high smoke point, 2) neutral flavor, and 3) its what I had on hand), and the alcohol, then simmered it at a low temp, burning off the alcohol. I strained the resulting fluid through cheesecloth and recovered between 1/2 and 2/3 cup.
edit [ the simmering off of the alcohol is dangerous. HAVE A LID ON HAND. And raising the temp higher than a simmer is not a good way to hurry it. Use a pan rather than a pot for extra evap. surface ]
I used that oil (still with some alcohol, but very little) in a basic brownie recipe, greased the pan with the cheesecloth wad (waste not want not).
Cut into 16 servings. One hour later, and the report is very very good.