Hot Potato Salad With Sour Dressing

This ubiquitous Germanic dish gives potatoes a new lease on low tuberous life. In Old Heidelberg, I remember kartôffeln, as potatoes are called, for breakfast, lunch, dinner, and tea. How odd that New World white potatoes were once so suspect that they did not enter the general European diet until the 1770s, when death by potato seemed the only alternative to death by famine. The well-fed Germans in this country, however, did not resort to potatoes until the Hessian fly brought in a