Put the onions and the apples in the bottom of the slow cooker.
combine pumpkin pie spice, salt, and both peppers in a small bowl and mix well.
combine ginger and garlic into a paste.
Rub the ginger/garlic paste over the outside of your roast. Follow it with the spice mixture.
Put the pork roast in the slow cooker. If your roast has one side with a layer of fat, make sure that side is facing up.
Top roast with the mustard seeds.
Slow cooker times vary. Be sure to stick in a meat thermometer and make sure the roast is at least 145 degrees Fahrenheit in the middle.