This Old-School Picnic Food Is A Perfect Way To Use Up Leftover Roast Beef - Chowhound

Annastills/Getty Images When you think of classic picnic fare, it may be things like sandwiches, salads, and spreads. Back in the day, there was an old-school dish that could be used as all of the above. And while there are some early 20th-century bites that may seem odd today, like sardine and egg sandwiches, this is not one of those, even though at first blush you may balk at the idea. It's roast beef salad,…