This tart (or pie, depending where you live) started its life as a very Southern, cloyingly sweet pecan pie in a layer of fudge chocolate, basically a quintessential Thanksgiving and festive classic. Handed down to me by a force of nature in my life, Claire was my London based surrogate American grandmother who taught me just about everything I ever needed to know about effortless entertaining with understated elegance. Many of my treasured pieces of crockery and linen were once hers and she is often in the kitchen with me, whispering suggestions and directions into my ear with her gentle, no-nonsense Southern drawl.