Dust your Work Area. Have about half a cup of flour ready by your work surface. Dust your working area generously with flour. Unwrap your base dough and pat it into a rectangular shape.
Layer butter dough over base dough. Using a rolling pin, roll the base dough into a 10 x 15 inch rectangle. Remember to dust the surface underneath your dough with flour to prevent sticking. Take the butter dough (the second dough) from the fridge. Unwrap and gently lay patches of the butter dough over the base dough, covering the entire rectangular area until all the butter dough is used up.
Incorporate the two doughs. Lay a big piece of plastic wrap (probably the one you used to wrap the dough) over the dough assembly. Roll the rolling pin on top a few times just to flatten and smoothen the chunks of dough on top.
First Fold. Fold the upper and lower end of the long rectangle so that the edges meet at the center (cross wise fold). Then, fold the dough vertically in half to make a smaller rectangle. Use the rolling pin to roll the entire thing into a 10x 15 inches rectangle again. Tip: a pastry scraper will greatly help to pick up the edges of the dough during rolling and folding. The dough can be very delicate. Also, flouring the surface, the rolling pin and the tops of the dough as needed is vital to prevent sticking.
Second Fold. Again fold the rectangle crosswise: upper and lower end towards the center so that their edges meet. Then, fold the square-ish dough lengthwise so that you have a small thick rectangle. Roll this out again into a 10 x 15 inch rectangle.
Shape the dough into a log and cut into 16 portions.. Starting on the long edge of the rectangle, roll the dough into a tight log. Roll and pat in so that it is16 inches long. Using you pastry scraper or a knife, cut the dough into 16 equal portions (just try you best or weigh the entire dough and calculate the weight per portion for a total of 16). Chill the dough portions for at least 10 minutes.
Flatten into discs and Fill. Use the rolling pin to flatten one of portion of dough into disc that is about ¼ inch thick (see note 2) Spoon about a tablespoon of ube in the center (a little bit more if you have a bigger portion of dough or less is you have a smaller portion).
Shape the Hopia. Gather the edges over the filling and pinch the seams to close. Shape the filled dough into a smooth ball. Then, using a 3 inches cookie or biscuit cutter, shape the dough into a circle hopia. Tip: If you do not have cookie cutter, simply flatted the ball of dough halfway until it is shaped like a thick disc.
Pan Fry. Heat a wide non-stick skillet. Pan fry the hopia over medium heat in batches, maybe 4 or 5 at a time depending how large is your skillet. Once the underside is golden, flip to cook the other side. Then, arrange the hopia so that they stand on their sides, cook briefly until lightly golden, rotating to cook the entire side.