Perhaps only those raised in the USA understand the alluring comfort of the peanut butter & jelly sandwich. I have friends in the UK turn up their noses in disgust at the mention of a PB&J sandwich (while they smear brown yeasty Marmite on brown bread).
I grew up with PB&J made with grape jelly, Jiffy peanut butter (I alternated between smooth and creamy) and grape jelly (which for the Brits is like jam without all the bits & clumps).
Enroute to Portland, OR at the Detroit layover this morning I bought a sandwich at the PB&J counter (Cashew butter on 7-grain brown bread w/ rasberry jam). It seemed the perfect flight food today–sweet, carby, nostalgic)