Wash and dry the rocket. Drain the beetroot slices (4-5 slices for each sandwich). Prepare all the other ingredients for your sandwich. Preheat the oven to 200 °C / 390° F (“top/bottom heat”).
Put the sweet mustard, honey, a little salt and pepper and the naturally cloudy organic apple cider vinegar in a small bowl. Mix with a whisk. Then add about 3 tablespoons of olive oil and mix all the ingredients evenly.
Place a sheet of baking paper on a baking tray and roughly crumble the feta over it. Then place it in the preheated oven for 15-20 minutes to gratinate.
Tip: If you are in a hurry, you don't have to bake the feta in the oven. Just crumble it onto a plate.
Heat some olive oil in a pan and toast the bread on both sides until it’s crispy.
Spread the dressing on a slice of bread and top with rocket, beetroot and feta, one after the other. Finally, place a slice of bread on top. That's it.