I was chatting to my 3 year old today about how, when I was little, pizza was quite an exciting thing. It's what they ate on American tv shows and there was no way you could get it delivered to your house. Got me thinking about things that are ordinary groceries now which were the pinnacle of fancy/unthought of in the 80s and 90s (and earlier!)
Avocados are another one. My mum would buy one for her and my dad as a special treat to eat with vinegarette from their special "avocado pear" bowls.
Mexican food as well. Old El Paso kits were the height of fancy pants when I was younger.
Halloumi, gets and hummus were things only my family seemed to know about (parents were stationed in Cyprus) and trying to explain squeaky cheese to my friends when we brought a huge brine-filled jug of the stuff back from holiday was hilarious considering it's totally normal now.