Peel shallots and garlic and cut into thin slices. Cook with bay leaves, cloves, coriander, fennel, vinegar, salt, sugar and 200 ml of water in a saucepan for 2-3 minutes. Pour the stock through a sieve into a bowl, mix with the mustard seeds. Cover and leave to soak in the refrigerator for 3-4 days.
Coarsely puree the mustard seeds in the blitz chopper or with the hand blender until the typical consistency of a coarse mustard is achieved. Fill into glasses so that there are no air bubbles in the mustard. Let it steep for at least a week in a cool and dark place
This mustard goes well with anything grilled. It can be stored in a cool and dark place for at least 6 months!