Make your own Dijon Mustard

I just watched on TV5 channel an episode of a French documentary serie called Epicerie Fine, presented by a famous French Chef Guy Martin. The topic was La Moutarde de Dijon. You can still view the whole program here (in French).

Actually, it is pretty straightforward to do your own whole grain Dijon Mustard.

You just need a mortar, mustard seeds, verjus (pressed juice of unripened white grapes) and some salt.

Just crush all ingredients in the mortar. To get rid of the bitterness and strong acidity, let mature for a few days. Here is the result...