Yep, in the 80's my Mam was a school dinner lady and mine were fed almost nothing but leftovers for years.
Think i remember the odd bag of Winalot or tin of Chappie but that stuff was too expensive. Mine dined on what kids didn't like, sliced beef, lamb, faggots, etc, with cheese pie, chips and semolina too. Sponge pudding an custard some days.
They feckin thrived on it..! ?