Open the ribs from their packages and rinse gently, patting dry.
Rip large sheets of tin foil for every rack of ribs you’re preparing and spray them with cooking spray.
For each sheet of foil, lay one rack of ribs onto it, and begin seasoning each rib rack in layers; first the salt and pepper, then the garlic powder, followed by the barbecue seasoning, pressing the seasonings down before adding the brown sugar.
Press the brown sugar down, and flip to the other side and repeat seasoning/pressing on the other side of the ribs.
Let the seasoned ribs rest for about 15 minutes while the oven preheats to 325 (or overnight, wrapped in plastic wrap, if being prepared the day before – for extra flavor)
Pour approximately ¼-⅓ cup of apple juice underneath the seasoned rib racks, being careful not to spill it on the ribs itself.
Fold the sides of the foil in first, laying loosely over the rib rack.
Fold your foil about an inch away from the sides of the ribs on either side, folding straight upwards.
Match the ends at the top until they are flat and even.
Fold over until all the way down.
Lay your wrapped ribs into a baking pan or baking sheet.
Bake in the oven for 2-3 hours, untouched.
Remove from the oven and the foil and preheat your grill.
The meat will be well-cooked, very juicy and tender, almost falling off the bone (if it isn’t already), so you’ll have to be gentle removing it from the foil. (You may want to cut it into smaller pieces to grill.)
Pour your favorite sauce into a bowl and get your baster ready.
Set your grill temperature to low, baste your ribs and place them on the grill for no more than 5 minutes; turn, baste again.
Cook for another 5 minutes on the second side; turn and baste again.
Remove from heat after a couple more minutes, immediately basting a third time before serving.
Let cool for about 5-10 minutes, so it’s easier to handle.