Grease a baking dish with butter.
Roll out the pastry into a large rectangle on a floured surface. Then cut into 6 squares.
On top of each square place an apple cored side up.
Cut butter into 8 equal pieces and place each into an apple opening, reserving leftover butter for the sauce.
Divide brown sugar evenly among apples poking some inside each opening and the leftover around each apple base.
Sprinkle apples with nutmeg and cinnamon.
Wet your hands and bring one corner of the pastry up with your fingertips to the top of the apple. Bring opposite pastry corner to the top and press both together.
Bring another two corners up in a similar way and seal together.
Now pinch down the sides slightly to seal completely.
Repeat the same with other apples, then place into a greased baking dish.
Combine together 1 teaspoon vanilla extract, 2 cups white sugar, 3 cups water, and reserved butter in a saucepan. Bring to a boil, then simmer at low until sugar is dissolved completely. Then pour over dumplings carefully.
Bake in a preheated oven at 400 F for 5o to 60 minutes.
Serve with sauce on top. Enjoy!