Kitty I assume it was like my Mum's lemon meringue and made with a packet mix with a little capsule in it?
My Mum did two weird things although this was 80s rather than 70s. She got a microwave and used to cook all the veg in it, one after another, then leave them in their cooking water and stick them on the table with a draining spoon. Then she would reheat any veg left from the previous day using the same method and so on and on. So we might end up with 3 day old cabbage that had been remicrowaved every day. Because she was also a believer in the saying that "if there is nothing left you haven't made enough".
And she still makes gravy without flour so it is essentially stock rather than gravy. ie just meat juices made to go further with water so quite pale in colour esp if poultry stock but with no fat removed (or mixed into the flour obviously) but just floating on the top. DH is well unimpressed having been bought up on bisto that you can stand the spoon up in.