For the sauce, whisk together 3 tablespoons of cream and egg yolk. Heat the rest of the cream. Season to taste with salt, pepper and mustard. Add whisked egg yolk. Wash the dill, pluck from the stalks and chop finely, stir into the sauce. Do not let it boil any more!
Peel and slice the cucumber. Blanch in boiling salted water for approx. 2 minutes and drain on a sieve
Finely dice the bacon. Leave it crispy in a pan. Arrange blanched cucumber slices and sauce on plates. Serve with bacon and dill