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Apple Jelly Filling
One large sour apple grated, juice of one lemon, one cup of sugar, one egg well beaten; mix all together and cook for five minutes, stirring all the time. Use for filling in layer cake.
— Mrs. Caroline A. Day
A cooked apple curd in all but name, thickened by a single egg rather than by pectin. It comes together in one small pan and needs steady attention for its few minutes on the heat.
- The hinge: keep it below a simmerOne egg in a cup of sugary apple juice will scramble the moment it boils. Cook over low heat, or in a bowl set over simmering water, stirring constantly until it coats the back of a spoon — around 170F. If it does break, a quick pass through a sieve rescues it.
- "One large sour apple"A cooking apple with real acidity: Granny Smith, Bramley, or a Northern Spy if you have one from a farm stand. A large apple grated on the coarse side of a box grater gives roughly a cup, loosely packed. Grate it into the lemon juice to keep it from browning.
- Five minutes is a minimum, not a ruleGrated apple releases a good deal of water, so it may well need longer than the stated five minutes on low heat before it thickens; go by texture, not the clock.
- Whether to peelThe receipt does not say. Peeling gives a smoother filling; leaving the skin on adds flecks and a little more body. Core it either way.
- Cool it completelyWarm filling soaks into cake crumb and slides out at the edges. Spread it on a plate, cover, and chill until set — it firms up noticeably as it cools.
- YieldAround a cup, enough for one layer of an 8- or 9-inch cake. Double it for a three-layer cake.
- KeepingAn egg-thickened filling is not a preserve despite the name. Refrigerate and use within three or four days.
Layer-cake fillings of this kind fill the community cookbooks of the late nineteenth and early twentieth centuries, where the same formula — fruit or fruit juice, sugar, lemon, one egg, cooked briefly — appears under names like lemon filling, orange filling, and here apple jelly filling. "Jelly" here most likely refers to the look and set rather than to any pectin work; the egg is doing the thickening. The appeal to a village housekeeper was economy and availability: one apple from the barrel, one lemon from the store, and an egg turned a plain two-layer cake into something finished. Sour apples were the ones kept for cooking through the winter, and their acid sets the flavor.