Slow Cooker Corned Beef with Veggies and Horseradish Sauce

corned beef, 3-5 pounds (flat cut preferred)

bay leaf

head garlic

whole cloves

peppercorns

allspice berries or small pinch ground allspice

whole onion

head cabbage, cut in 4 pieces

carrots, cut up if large

(You could add onions if you wish)

mayo, lite mayo, or sour cream (or use a combination)

cream style horseradish