Cold French-Style Pot Roast

I’ve always had a secret love of leftovers—the doggy bag from that fancy restaurant provides a more special treat the day after, when I can munch away, sitting in an old pair of shorts in my garden. French cooks have made an art out of les restes. They turn many a delicious hot dish into a transcendental cold one that has a magical depth and subtlety hot dishes often lack. But there’s a problem