5: Add 250 ml liquid cream, salt, pepper and mix well. Bring to the boil, then turn the heat right down and leave uncovered to thicken gently.
6: Fry 4 steaks of beef tenderloin in 2 tablespoons olive oil with a large sprig of rosemary (see these tips).
7: Serve one steak per person plated up (on heated plates), with the creamed beetroot tops and mushrooms on the side.
Remarks
You can use any vegetable tops that would otherwise go to waste, but beetroot leaves have an amazing flavour, similar to spinach, so I encourage you to try them.