Crock Pot Apple and Brown Sugar Corned Beef & Cabbage

3 - 3 ½ pounds corned beef brisket

8-10 small red potatoes (about 1 ½ lbs) halved or quartered, depending on size

4 carrots, cut into 1 ½-inch chunks

1 large onion, cut into 8 pieces

1 small head of cabbage, cut into chunks

3 cups apple juice

1 cup brown sugar

1 tablespoon Dijon mustard (or brown mustard)

additional Dijon mustard for topping (optional)

caraway seeds for topping (optional)