10 - 15 Min
1) Cut the upper side of the rolls open.
2) Mix in a bowl the sour cream and mustard. Season with salt. Add the sauerkraut and thyme leaves and toss to combine.
3) Place the sausages in a pan with hot (not boiling) water for 2-3 minutes.
4) Top the rolls with lettuce, sauerkraut, a sausage and cornichons.