Preheat the oven to 350 degrees. Pick through the crabmeat to remove bits of cartilage etc. In a mixing bowl combine the crabmeat with the scallions, celery and bell pepper. (Make sure the green onions, celery and bell pepper are very finely chopped because they won't cook in the oven and you don't want their raw texture to be intrusive.) In a separate mixing bowl combine the mustard with the butter and cream. Combine the crabmeat mixture with the melted butter and cracker crumbs. Season with 1/2 teaspoon of salt and Tabasco sauce to taste. Transfer the mixture to a baking dish. Top with additional cracker crumbs and bake for half an hour until the top has browned.
Variation instead of combining crabmeat vegetables with the butter and cream combine it with 3/4 cup of evaporated skim milk mixed with 1 teaspoon dry mustard rather than the Dijon mustard.