Prep. Lightly spray the slow cooker with cooking spray and set aside. Rinse pork roast and pat dry.
Add garlic. Place pork roast in a 6-quart slow cooker and spread minced garlic on top of the roast.
Mix. In a small bowl, mix together salt, thyme, sage, cloves, and lemon zest.
Season. Sprinkle seasoning over pork roast, making sure to cover the top and sides of the roast.
Cook. Add ½ cup water, place the lid on, and cook on low for 6-7 hours or high for 4-5 hours.
Make gravy. Once done, mix ¼ water and cornstarch together. Add to juices in the slow cooker to form a gravy.
Slice. Slice or shred pork roast and remove the bone.
Serve. Serve with mashed potatoes and enjoy!