(Nederlandse versie beschikbaar)
| 750 ml beef stock | 2 tbsp. Meaux mustard (or any other grainy mustard) |
| 10-15 g dried boletus mushrooms (preferably Boletus edulis) | 200 ml tepid water |
| 1 onion, finely chopped | Butter |
| 20 ml single cream | pepper |
| 1/2 tsp. fresh chives, chopped | salt |
| 1/2 tsp. fresh parsley, chopped |
