We've been experimenting with making our own mustard using Kevin's Grandma's recipe. It turned out good but very hot! Here is the recipe:
2 TBSP dry mustard
1TBSP cider vinegar
pinch garlic powder
hint of nutmeg, cayenne pepper, black pepper
1/4 tsp vegetable oil
Combine mustard and vinegar to smooth paste.
Add other ingredients and mix well.
Let stand an hour.
And we already started experimenting with different varieties.
Honey Mustard: add 1/2 TBSP honey and 1/2 TBSP water/beer
Cumin Mustard: add 1/4 tsp cumin and dash water/beer
We're not sure what the advantage of putting beer in mustard is, you cant taste it but it will make it sound fancier. Next we have to experiment with making it less hot so that other people will like it too. Also so that you can put enough mustard on your sandwich to actually taste our variations.