The inexorable rise of identity condiments has led to hard times for the most American of foodstuffs. And that’s a shame. [snip] Along about a decade ago, though, I began to notice I was toting home as much of my offerings as I’d concocted. My contributions were being overlooked — or shunned. Why should this be? Mom’s extraordinary potato salad — fragrant with dill, spiced by celery seed — went untouched on the picnic table. So did her macaroni salad, and her chicken salad, and her deviled eggs. … When I carted home a good three pounds of painstakingly prepared...