Real ice cream, the kind with lots of butterfat, seems to be nearly extinct. Culinary Darwinism truly favors survival of the fittest these days, so natural selection is in favor of frozen yogurt. Only a few places, most of them the remnants of chains, still serve real ice cream, scooped on a cone. David J's is primarily a wholesaler--you've eaten their cappuccino pies and specialty ice creams in many of Dallas' best restaurants--but they do keep a tiny shop open at their factory on Alpha Road, just west of the Tollway. Stop in and indulge.