Mix ginger, garlic, soy sauce, honey, and sherry in a small bowl. Dip chicken pieces into sauce; place chicken in crockpot and pour remaining sauce over it. Cover and cook on Low. Will be ready in about 6 hours. Remove chicken to warm serving dish. Pour juices into skillet. Blend cornstarch with a little of the cooled sauce, then whisk into skillet. Cook over low heat until thickened. Pour a little sauce over chicken and pass remainder. Serve over hot rice.