Mustard
Products with childhood-flavour are, most of the time, the cheapest ones.
This supermarket brand mustard has a flavour of a summer barbecue. Smoky meat and grilled crispy bread, which I too covered with mustard.
Mustard that’s just pretend-spicy, tartness coming mostly from vinegar.
Mustard the flavour of my childhood dinner. Boiled sausage, with a slice of bread and butter. Meat so processed we’d now call it child abuse; the best kind.
Mustard mixed with ketchup and mayo was my pretend bechamel. Fake meat with fake bechamel sauce. Not so far from what I eat as an adult vegan.