Occassionally there is a burger van in the Sainsbury's car park in Wakefield.
Driving past it last week I got a strong whiff of fried onions and beefburgers; it reminded me so strongly of going to Heath Common fair when I was but a youth; the rides there, the cocks and hens and the waltzers, and the roll a penny games.
What smells bring back nostalgic memories for you?