800g of peanuts give 700g of peanut butter – why? I’m making my own peanut butter from roasted peanuts that I’m buying. I just got a wet grinder in order to make a larger amount at the same time.
From the packaging I know that I used 800g of peanuts. But the end result was 692g of peanut butter. I expected it to be the same as what I started with, but am I simply wrong in this assumption? Or does that loss come from leftover peanut butter on the sides and floor, plus the small amount that I tasted during the making?
About 100 grams of peanut butter will fit into about 6 tablespoons, or slightly under 1/2 cup.  If you tasted, and there was peanut butter left on the sides and floor of wet grinder, that could certainly explain the difference. There is really nowhere else for it to go.