Royal Squash

From 1922:

Thinly slice green or yellow squash, add one or two slices onion, pepper and salt to taste, and cook in just enough water to keep from burning. When tender, drain them, mash until smooth and put in a frying pan in which has been placed enough bacon drippings to thickly cover the bottom. Keep stirring slowly over not-too-hot a fire until mixture scrapes clean when stirred. Warning: it is very easy to burn, thus the medium fire.