1: Preheat the oven to 360°F (180°C). Spread 60 g mustard seeds on a sheet of cooking parchment laid on a baking sheet. Put the mustard seeds in the oven for 15 minutes to dry roast.
2: As soon as you take the seeds out of the oven, tip them into 60 g water, stir briefly, then leave on one side to cool.
5: Gather the dough into a ball and transfer it to a large, clean bowl. Cover with a plastic sheet and leave for 1 hour 30 minutes.
6: After this time, cut and weigh out the dough into 100 g lumps.
7: Roll these into balls.
8: Arrange the balls evenly spaced on a baking sheet. Cover with a plastic sheet and leave in a warm place to rest for 2 hours.
9: Bake at 460°F (240°C) for about 25 minutes, until golden brown. Note: As when baking any bread, you should ensure that the oven is filled with steam for the first 15 minutes of baking. This page shows you how; it really is the secret of golden-brown, crusty loaves..
You may well have noticed in the photo for stage 3 that I am not using normal French mustard paste, but the classic British powdered sort, made by Coleman's of Norwich. If you wish to do the same (which works well), use double the stated quantity of mustard paste: e.g. if the recipe asks for 30 g of mustard, use 60 g of powder.