Serve about half of these hearty pork appetizers at a time, keeping the rest warm in the slow cooker until needed.
Stir together sweet-and-sour sauce, pineapple juice, brown sugar, and ground ginger in a 3-1/2- or 4-quart crockery cooker. Set aside.
For meatballs, combine beaten egg, graham cracker crumbs, and milk in a large bowl. Add ground ham and pork; mix well. Shape into 30 meatballs. Spray a 12-inch skillet with nonstick coating. Add meatballs and brown on all sides over medium heat.
Add browned meatballs to crockery cooker. Stir to coat with sauce. Cover, and cook on low-heat setting for 4 to 5 hours or on high-heat setting for 1-1/2 to 2 hours. Serve immediately or keep warm on low-heat setting for up to 2 hours. Makes 30 meatballs.