If your kitchen is very warm, refrigerate all of the dough ingredients for 30 minutes before making the dough. If the dough ever becomes too soft and/or sticky to work with, simply return it to the refrigerator until firm; a dough scraper also comes in handy here. There should be plenty of dough to cut out and make 48 empanadas without having to reroll any dough scraps; we found the rerolled scraps of dough to be very tough. The filling can be made while the dough rests in the refrigerator.

http://www.cooksillustrated.com/recipe.asp?recipeids=3988&bdc=47856

I’ve got rid of the corn starch in the marinade – doesn’t add anything to the flavour and just makes it hard to cook the meat [sticks to the wok]