Frig. I haven't had an issue with it getting sludgey. Still, I wouldn't dare try to stir any nut butter with a stick blender, even at room temperature - I've burned up way too many full-sized blender motors in my lifetime, blending things that were not nearly as thick.
I rarely even buy tahini any more, I just make it up as needed from hulled sesame seeds (which I also store in the frig). But what I do with peanut or almond butter when I bring it home is turn the jar upside down for a day or two - if it's been on the store shelves for a while and is really hard at the bottom, I might do that once or twice more - then stir it thoroughly with a butter knife before putting it in the frig.



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Thanks for reminding me, ah, living on or near tahiniland 
There in the middle east, how long does a jar of tahini last you? Here in the mideast USA, a 12-oz jar might last a year or longer. I'll still keep it in the frig.
