Soup veloute with "grass folk"

1 pound mixed greens found in popular market: radishes, Myron kafkalithres, poppies, spinach chard ...
5-6 tbsp olive oil
1 large potato peeled and diced
1 green apple peeled and cut into cubes
1 liter of water
1 bunch herbs knorr
1 pinch ground allspice
Salt and pepper
zest of 1 lemon   https://plus.google.com/117698262032662778734/about
100 gr. yoghurt
4 large nuts oil

Process

Peel and wash the vegetables and cut them in half. In a saucepan, heat the olive oil and sauté the greens. Season with salt and pepper and allspice. Add the diced potatoes and diced apple. Stir with a wooden spoon and add the water and the bouquet of herbs. Let the greens cook for 15-30 minutes. We check the seasoning and remove from heat. Puree in blender. In a bowl unite yogurt lemon zest salt and pepper. To serve put on each plate by a nut oil and pour over the hot soup. In each dish and put a spoonful of the mixture with the yogurt.