We the mustard seeds should be added alone (without the soaking vinegar), which is why Chris’s finished product came out thin. Will also add this to our list of errata. I made the mustard last night. I drained the soaking vinegar and put everything into a blendtec blender but it just pushed all the seeds to the sides and was too dry to blend anything. I had to add all the soaking vinegar back in plus a little bit of water to get it to mix properly and it's still pretty thick. After reading the quote above I just realized I forgot to blanch the mustard seeds so maybe that is part of it. Oh well, I'll see how it tastes next week. Also checked the errata last night and didn't see anything about the mustard.