Stew mix of vegetables. Boil and potatoes. Grate them at in large pieces grater and mix with vegetables. Likewise grate the feta cheese, sausage and eggs. Cut and pickles, along with olives. In a small bowl, mix the yogurt and mayonnaise with a little pepper (of your choice). Judge for yourself how much to pour the sauce. You should get something like potato dough. Knead the dough using a spoon for easy hands. Use a flat container and form a ball. Using a spoon or utensil that you are comfortable smear cake with mayonnaise. Grate the onion and cheese feta cheese and sprinkle. Use a little fantasy for decoration. Put in the fridge to set.