Ingredients  Dough:  1 cup Water;  1 cup All- purpose flour;  1/2 tbsp Butter;  1 Lemon peel;   Salt.    Filling:  3 tbsp Canned corn;  3 tbsp Diced carrots;  3 tbsp Sliced mushrooms;  3 tbsp Sliced Olives;  3 tbsp Diced onions;  1 tbspButter;  1 cup Milk;  2 tbsp Flour;  Parsley;  Salt;   Pepper.    Assembly:  1 Beaten egg;  Fine breadcrumbs;   Oil to fry.      Preparation  Dough:  1. Put the water in a pan with the butter, salt and lemon peel and let it come to a boil.  2. When the water starts boiling, remove from heat, take the lemon peel out and add the  flour.  3. Get the pan back on low heat and work the flour with a wooden spoon until it looks smooth  and dry.  4. Place the dough on a working surface and kneed for a minute or two, just until it becomes  even and leave it until we're ready to use it.  Filling:  1. In a pan on medium low heat, melt the butter and throw in the onions.  2. When the onions are softened, add the rest of the vegetables and allow...