I tried to make mustard many years ago, and failed quite miserably. Gersvinda was good enough to help me figure it out :)
No pictures yet, that's coming soon.
My measurements are highly approximate, btw.
First, we have to cover some chemistry. Mustard seed (broken open) + water = SPICY. This reaction happens FAST. I would say, 5-10 seconds.
The reaction can be stopped by acetic acid (vinegar).
So, it is VERY important to keep the wet and dry ingredients separate until the moment of truth.
Dry Ingredients:
2 TBS whole brown mustard seeds, whirled in a coffee grinder or mashed in a mortar and pestle until a lot of them are broken.
2 TBS dry yellow mustard, ground.
2 TBS brown sugar
1/2 tsp salt
1/2 tsp dry garlic powder
Wet Ingredients:
MINIMUM of 2 TBS vinegar.
1/4 cup beer, wine, water, or other not too acidic liquid.
Mix the dry ingredients together. If you want VERY spicy mustard, add water, then vinegar (quick quick!). I add mine at the same time (I mix them together).
I microwave it for 30 seconds, then stir and taste.
It thickens up a LOT, so I usually add more "water" at this point.
Hooray mustard!