Combine ingredients EXCEPT corn starch and water into gallon size freezer bag and freeze til needed. Thaw before slow cooking since meat can dangerously harbor bacteria if kept at warm temperature for too long as happens when frozen meat cooks very slowly.
When ready to cook, dump bag into slow cooker and cook on low for 7 hours. Whisk corn starch and water in small bowl, then whisk into slow cooker. Cook another hour.
