As sweet and salty combinations go, peanut butter and jelly (or jam) is one of the classics. I remember desperately wanting to copy the kids I saw on all the Nickelodeon shows and make PB&J sandwiches after school. The bread had to be thick and white, the peanut butter smooth and the jam generous. These tarts are a fun spin on the popular pairing, with a rich, peanut butter cream and a good dollop of jam – ideally grape jam, if you can find it, but raspberry or cherry also work a treat.