I love to cook a pork butt for pulled pork. I have had good success doing a 10 lb. bone in butt at 230 degrees at the grate for 15 hours. After I pull it and put it in a crock pot to keep warm it seems to dry out. Is there something I could add after I pull it to keep it moist?
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two totally different things in pork butt make us perceive it as moist: melted gelatin (converted from collagen), and water.
the gelatin is slippery, and 'wets' the surface. it's what makes the pulled pork, which is essentially way overcooked (dry) pork taste soft and moist. it's dried out overcooked pork re-wetted with some thing that doesn't evaporate, gelatin. that gelatin is why it is stiff the next day in the fridge. it re-congeals. and heating it up takes as much energy as making gelatin from collagen in the first place, which means the pork can get even drier with each reheating.
the other thing that gives meat its moisture is water. when you cook a steak or pork chop to medium rare, you have a lot of water left. lot of so-called 'juices' on the plate and in the meat.
but when you heat a giant chunk of meat for hours on end at 250, and then take that meat to just a few degrees under the actual boiling point of water, you are driving off that water. then, shredding it, you expose what little water there was left to the air. that water is at 200 or so degrees, and so it evaporates quickly, leaving you banking entirely on the gelatin to trick your brain into thinking the meat is moist.
you can disguise the loss of water by adding broth and sauces, but the very nature of pulled pork is a fleeting perfect thing which can't be then bent to your will.
once it is pulled, the moisture is gone. but letting it cool whole, in an attempt to 'keep moisture in' is a fool's errand. because you will need a lot of heat again to melt the gelatin, and that will send what little moisture (which actually was retained by wrapping and cooling the meat) heading for the hills. you'll dry it out more in reheating, and it will seem that much drier than if you just pulled it and ate it.
if i can't have it right then and there, immediately after cooking (which is rare), i pull and put into ziploc bags for reheating the next day. it'll be good, but it can't be as good as it was when first cooked.
anything left gets vacuum sealed and frozen, or used in things like ABTs, pizza, etc, where the lack of moisture won't be as apparent
You can add cola also.
Little rootbeer, little apple juice,little orange juice, drippings...
I use apply juice for the drip pan, refilling as necessary during the cook. I strain the drip pan after removing the butt and keep the remainder. After pulling pork I add a small amount back into the pulled pork and mix it all up. Adds good flavor and moisture.
When I put in ziplock to put in the fridge I will also add a small amount of the liquid back to the ziplock before putting in fridge. We've had nice and moist bbq out of the fridge for a couple of days.