Two things which I remember tasting gorgeous for the first time were:
cheesecake - the frozen BirdsEye one which came topped with cream, strawberries in syrup or blackcurrants.
My mother insisted we have the one with blackcurrants as the strawberry one would be too sweet and the cream one too rich.
Naturally, I yearned for those, but the blackcurrant one was still pretty amazing.
The next flavour sensation was:
M&S prawn and mayonnaise sandwiches. Wow! Must have been late '70s/early 80s. My mother and I had been shopping in the nearest city and bought these to eat on the bus coming back.
Sadly, my mother tried to replicate them using tinned prawns in vinegar instead of frozen, salad cream instead of mayonnaise and plastic sliced white bread instead of the oaty bread.
It didn't replicate the feeling of fishy, creamy angels dancing on my tongue that the M&S ones had provided.
We always had roast chicken on Sundays followed by chicken curry (obvs with sultanas, desiccated coconut etc) or proper spaghetti with a sort of chicken bolognese sauce on Monday.
The latter had to have a sprinkling of dried Parmesan from a tub on it, even though we all hated it, because it made our bolognese-made-with-chicken authentic
At least my mother knew how to cook pasta.
I did a holiday job at a hotel in town in 1981 and for a buffet the chef made spaghetti bolognese for one of the dishes.
Of course, it was kept warm in one of the hostess trolley style things. He had no idea it would carry on cooking...
By the time people came to eat it it could practically be served in scoops like mashed potato
(obviously not envy).
Since tinned pasta was so prevalent, I think a lot of people didn't realise there was a problem.