Melt the butter in a saute pan, saute the onion, bell pepper and celery until tender. In a large bowl, whisk together the egg, sour cream and spices. Stir in the crab meat, sauteed vegetables, green onion and 1/2 of the saltine crumbs. Mix thoroughly. Form into 2 inch patties and coat with the remaining saltine crumbs. Saute in vegetable oil until golden brown.