Herring Salad (dairy or pareve)

Add to my passover recipe box

2 cups herring in sour cream or pareve equivalent
1 Granny Smith apple, chopped
2 hard-boiled eggs, finely chopped
1 tablespoon white horseradish
1 stalk celery, finely chopped

Mix all ingredients together, cover and chill. Add more sour cream for extra creaminess. Serve on a bed of lettuce.