Buy 2 loaves of round rye bread without seeds (unsliced). Slice top off of one loaf Scoop out bread from inside. Cut extra loaf into cubes (and middle of other loaf).
Fill with following mixture:

1 pt sour cream
1-1/2 c mayonnaise
2 t chopped onion
2 t dill weed
2 t beaumond
2 t parsly flakes
3/4 lb chopped corned beef.

Source: Georgene Conde