Simmer sausages in water to cover 10 minutes. Drain. Place eggs, milk, bread, salt, worcestershire, dry mustard, stock base and onions in blender container. Cover. Blend til smooth. Place ground meat in mixing bowl. Pour in blender contents. Mix until smooth.
Pat half of meat loaf mixture in bottom of crockery pot. Cover with sausages. Top with remaining meat loaf. Pat to seal. Combine ketchup, mustard, and brown sugar. Spread over meat.
Peel potatoes. Cut in strips (French Fry style). Coat well with butter and place around meat. Cover. Cook on High for 1 hour and reduce to LOW and cook for 6 hours.