Finely dice the onion, cucumber and mushrooms. Season with salt and pepper. Mix with chopped herbs.
Season roulades on both sides with salt and season with pepper. Spread a thin layer of mustard on the inside. Spread the stuffing evenly on top. Roll up so that the filling does not run out. Tie with spaghetti.
Fry in a casserole. Let brown first seam down, then all around. Boil off the gravy with the white wine. Add enough clear soup to cover about 2/3 of the roulades. Steam for about 90 minutes with the lid closed. If necessary, add liquid with water. Season the sauce, maybe thicken it a little bit.
Serve with : mashed potatoes
Our tip: It is best to use fresh herbs for a particularly good aroma!