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Apple Jelly for Cake
Mrs. P. B. Ayer.
Grate one large or two small apples, the rind and juice of one lemon; add one cup sugar; boil three minutes.
A cooked apple-and-lemon filling for spreading between cake layers, of the kind that turned a plain butter cake into something worth serving. It is essentially a quick apple curd without the egg, and it depends entirely on the pectin in the fruit.
- Use a tart, firm appleThe set comes from the apple's own pectin, which is highest in tart, slightly underripe fruit. Granny Smith or Bramley will thicken; a mealy Red Delicious will give you sweet apple mush that runs out of the cake.
- Grate on the coarse sideFine grating turns the apple to pulp that scorches quickly in a sugar syrup. A coarse grate keeps enough texture to read as fruit, and the shreds soften in the three minutes given.
- Three minutes is a rolling boil, not a simmerBoil rather than simmer -- 'boil three minutes' most likely means the pan is actually bubbling once the sugar has dissolved. Stir and scrape the bottom with a heatproof spatula, since a cup of sugar against grated fruit can catch and taste burnt.
- The lemon is doing chemistryAcid is what allows pectin and sugar to set. Use the whole rind and juice as written; skipping the zest costs you flavour, skipping the juice costs you the gel.
- It sets on cooling, not in the panOff the heat it will look alarmingly loose. Cool it completely, ideally in the refrigerator, before spreading. If it is still runny cold, return it to the boil for another minute or two.
- VesselUse a small non-reactive pan, stainless or enamelled. Bare aluminium or cast iron will pick up a metallic taste from the lemon acid and can dull the colour.
- YieldThe recipe gives none; expect roughly a cup, give or take, which will fill one layer of an eight- or nine-inch cake. Double it for a three-layer cake.
- KeepingThis is not a preserve and has no canning step. Treat it as a fresh filling: covered in the refrigerator, three or four days at most.
Fillings like this belong to the era when a layer cake was assembled at home from whatever fruit was in the cellar, and grated apple was one route to something glossy and tart between the layers. Apples hold pectin and acid in useful proportions, so a cook could get a spreadable jelly out of three minutes on the stove without gelatine, isinglass or a thermometer he traditditional base for setting other, less cooperative fruits. The Home Cook Book was a North American charity compilation, gathered from contributing housekeepers and printed with each recipe credited to its donor, which is why this one carries Mrs. P. B. Ayer's name rather than an author's. The format left recipes bare: no yield, no pan size, no temperature, and an assumption that the reader had made a cake before.