Over the past few years, food marketers and retailers have been concerned that an almost overwhelming assortment of packaged foods and an increasing demand for fresh have caused consumers to cut back on shopping the less-glamorous center-store aisles. But the growing practice of self-enhancing the flavor of foods with sauces, syrups, and spreads, a penchant for gourmet, specialty, and organic items, and unprecedented growth in home entertaining have sent shoppers scurrying down the dry-grocery a…