Preheat the oven to 200C/400F degrees.
Place beets in a pan and grease them with a little oil and salt.
Bake the beets in a foil-wrapped baking dish for about two hours in an oven preheated to 200 degrees, or until completely softened. Can take more.
Meanwhile, chop all the green leaves and set aside.
Chop the pistachios and toast them on a pan until they become crunchy and with a nutty smell. About 10 minutes on medium-high heat. You can also bake in the oven for about 10 minutes in a separated pan. When they are ready, take them out and put them aside.
Prepare the dressing - mix all the sauce ingredients in a bowl and keep in the fridge until serving time.
When the beets have softened, take them out of the oven and wait until they cool down. Cut into bite-sized medium cubes, and place in a large salad mixing bowl.
Add the leaves, the roasted pistachios, and the sauce and mix.
Sprinkle over as much vegan feta cheese as you like.