I love that blog, Joel! Thanks for introducing me to it.
I made mustard several months ago, kind of going on instinct. Ground probably a cup of brown mustard seeds in our grain grinder, then ground just a few wheat berries to clean out the mustard. Added a little bit of sourdough starter to this seed berry combo, enough apple cider vinegar and water to make a stiff paste, and some salt. I'm pretty sure that's all that's in there, and it's nice as something to add to a sauce but it's pretty danged spicy for just spreading on things. I'm pleased to read it can't go bad, I expected as much, but I made a huge jar of the stuff and I don't use a lot of it at once.
I think the ultimate is stirring a big spoonful of the above mixture into a french egg-butter sauce. I call my version "bernadaise" cause it's usually somewhere on the spectrum between hollandaise and bernaise, depending on what kind of acid I've got in the kitchen that day. The egg-butter (I use ghee actually) fat combo helps calm the mustard spice, plus the mouth-feel of that stuff is pretty much unmatched.
I'm intrigued by using nuts as a fatty spice-soother. That's an application where using our own black walnuts would be feasible. The information about cool water vs hot water and adding water before acid is all very interesting too. When I finally finish my jar I'll be all set to try out different methods to get various results. I LOVE mustard.
I miss Philadelphia and
that cheese store with open barrels of beautiful multicolored and flavored olives.....so old world and rare in these modern times.