Mix the vegetable stock cube with the water. Put all the ingredients for the dressing in a blender and blitz. Refrigerate until chilled.

Boil a pan of salted water. When boiling vigorously blanch the fava beans one tablespoon at a time for 1 minute and set aside to cool. Each batch should be blanched and removed with a slotted spoon whilst shelling the beans that were done in the previous batch. Squeeze the outer skin off and put the shelled beans in a bowl. This is a fiddly job and should be done somewhat in advance.

Spray a deep fry pan with Spray2Cook and put on a high heat. When the Spray2Cook is bubbling add the onion and stir-fry for 1 minute. Add the beetroot and stir-fry for 2 more minutes. Continue to stir-fry for a further minute when sprinkling with the thyme and garlic. Remove from the heat and allow to cool. Mix the beetroot and onion with the leaves and pour over the vinaigrette whilst mixing. Toss the salad with the feta and beans and serve immediately.