I will show you how to do an low and slow slicable BBQ picnic ham. For this instructable I am doing a slicable ham, 180 degrees which should be done in about 6 hours. You can continue to cook the ham about another hour (until it's190 degrees), and have Pulled Pork

Step 1: What You Will Need:

1) A water bbq smoker
2) A picnic ham 7-9 lbs and a storage bag that will hold it
3) A sharp knife to remove fat cap
4) A Spice Rub
5) Butchers cotton twine
6) 3 cinder blocks with a grill grate
7) Charcoal brickettes
8) Wood chips and aluminum foil
9) An instant read thermometer

Step 2: Make a Spice Rub

There are many spice rub recipes on the Internet, but they all seem to contain a lot of sugar. I used to use these recipes, but after 6 hours, the meat would come out almost black. It was delicious, but to look at it you would think it was burnt. For presentation sake, I strive for a nice mahogany color when the meat is done.
My spice rub:
1 cup paprika
1 cup chili powder
1/2 cup kosher salt
1/4 cup onion powder
1/4 cup garlic powder
3 TBL granulated sugar
1 tsp Black pepper
1 tsp Cayenne pepper
1 TBL molasses

Mix all the dry ingredients together and then add the molasses. Mix together with a fork, or in a mortar and pestal. It will still be a dry mix.

Step 3: Prepare the Picnic Ham

I remove the fat cap from the ham. Because I am using a Water BBQ Smoker, the meat stays juicy even without the fat cap.
Take a sharp knive and carfully remove the fat from the ham. If the ham is very cold, it makes the job easier.
Apply yellow mustard generously to the ham and apply a good coat of your rub mix to the outside. Then do the other side. Note: The mustard gives the spice something to stick to, but will cook away and leave the spice rub on the ham. Although called a rub, don't rub it in.
Put the ham in a large freezer storage bag and refrigerate from overnight to 24 hours.

Step 4: Smoking Day

Take your Ham out of the refrigerator while you set up your smoker and start the coals. Soak about a cup of wood chips in water.
I take 2 cinder block and put an old BBQ grate I found being tossed out over them and add another on top for a impro charcoal starter. Add some paper through the grate. If you have any of the match-lite type charcoals, you can put 4 on the bottom of regular carcoal to help start them. Start with about 40 brickettes of charcoal. Light them up.
Fill the water pan 3/4 full of water to begin. The ham will release fat into the pan and you don't want it to run over onto the coals.
Make a foil package of the woodchips to put on the coals.
Put the ham on the top grate and cover.
Wait until the coals are covered with a white ash before putting them into the smoker. Add the chips over the coals.
You will be making and using 3 of these wood chip packs 1 an hour for the first 3 hours. You will also have to add an additional 16 charcoals every hour for the total cooking time of 6 hours.

Step 5: Keep the Smoker at 225 Degrees for 6 Hours. Start Check of Temp at 5

I try to keep the temperature at 225 degrees but no higher than 250 degrees. I don't have vents on my lid, so I have to use the door to let excess heat out if needed. By adding 16 coals every hour, I haven't run into the problem of not being hot enough. I plan on cooking the ham for 6 hours, but start checking after 5 hours. I want a temperature of 180 degrees because I want the ham slicable. If you cook until 190 degrees, about 1 additional hour you will have pulled pork. Both are good, it just depends what you're going for.