For the sauce 1⁄8 mix l cold water and sauce powder in a pot. Bring to the boil while stirring. Cut butter into pieces and fold under. As soon as the butter has melted, remove the pot from the stove.
Stir in mustard and season the sauce with salt and pepper. Keep warm.
For the steaks, pat the meat dry and cut off the fat edge. Cut the steaks in half crosswise. Heat the oil in a pan and fry the steaks on each side for about 1 minute. Season with salt and pepper.
Remove the bacon from a pan without fat and fry it on a medium heat for 2-3 minutes on each side (medium). Wrap in aluminium foil and let it rest.
For the eggs, boil 1 1⁄2-2 l water in a large pot. Pour in vinegar. Poach the eggs in it. Lift the eggs out of the water with a skimmer and let them drip off on kitchen paper.
Halve the slices of bread and arrange each with 1 steak, 1 poached egg and some sauce.