optional additional ingredients are white wine, beer, cider, honey, caraway, coriander, rosemary, and chillies (not Whole30 approved)
Equipment
mason jar
food processor
rubber spatula
Instructions
Place both mustard seeds in a mason jar. Pour in the vinegar and close the lid tightly. Leave on the counter overnight.
Next morning place the mustard seeds and the added flavors into a food processor and blend until you get a desired consistency. The yellow mustard will grind more and the brown will stay whole. That's how you get the stone ground looking mustard.
Adjust seasoning to your liking, if it's a bit thick you can add a little bit of water to make it more thinned out.