Old recipes: prepared mustard

Yesterday was an almost rainy, quiet Sunday afternoon and I found myself going through some old recipes. I hate to throw recipes out, even though I've had them for years and have never (yet!) got around to trying them... be that as it may, I rediscovered a few that I really, really should have tried a long time ago. They would have saved me some money and been fun, too.

One of them is how to make prepared mustard (for your hotdogs and hamburgers):

1 1/2 ounces mustard seed or powdered mustard (If you grow mustard greens, let some go to seed and use it, or you can use wild mustard seed, pennycress or even part radish seed)
2 ounces of water
4 ounces of vinegar (1/2 cup) - the recipe doesn't say, but I would use apple cider vinegar
1/8 tsp nutmeg
1/8 tsp turmeric - probably optional; it gives mustard its color
1/4 tsp celery seed
1/2 tsp salt
2 tsp sugar - this seems like a lot of sugar to me, so I'll taste it before adding it all.

Blend all ingredients and cook over low heat, stirring constantly, until thick and smooth. Again, the recipe doesn't say so, but I would mill the seed first (use your blender on high), then add the rest.

If you try it, let me know how it works for you!