When I think of retro food, I think of 70's favourites like prawn cocktails. I've never actually had one but thought it would be easy to veganise using Fry's crispy prawns. In hindsight, I wish I'd have used something like Vbites making waves fishless fingers as they are, in my opinion, pretty fishy! The Fry's ones were hugely disappointing, it just tasted like their chicken nuggets with a minuscule amount of seaweed (really, it's the last thing on their list of ingredients). They weren't bad, just not at all fishy in any way and for £3.99 for a box, they should be better than their cheaper competitors.
That said, with the cocktail sauce I made, it made for a pleasant retro experience. I baked the 'prawns', left to cool then removed the batter. Chopped the fishless strips into smaller pieces and mixed in to a bowl of cocktail sauce (vegan salad cream, ketchup and a dot of tobasco......you can use Mayo instead but will need something like sherry vinegar to give it that tang).
I served it in an avocado and munched my way through my retro treat.