Wash the steaks and dab dry with kitchen paper. Wrap 1 slice of bacon around each steak and fix it with wooden skewers. Clean and wash the leek and cut it into thin strips about 3 cm long.
Drain the pumpkin on a sieve and collect the juice. Heat the fat in a pan and fry the steaks for 3-4 minutes on each side. Season with salt and pepper and remove. Keep warm.
Add leek and pumpkin to the frying fat and braise for about 2 minutes. Add mustard seeds, 4 tablespoons pumpkin juice and cream. Bring to the boil and thicken with sauce thickener. Season with salt and pepper. Let it boil through a little bit at low heat.
Arrange the vegetables with the sauce on a plate and serve the steaks on top. Garnish with parsley. Potato cookies or potato croquettes taste good with it.