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Frosting to Spread Between Cakes
Whites of three eggs, beaten to a froth, add four tablespoons sugar, juice and rind of one orange, spread between layers.
This is an uncooked egg-white filling: the whites are beaten, sweetened, flavoured with orange and spread straight onto the cake. Nothing in the method brings the eggs anywhere near a safe temperature, and nothing afterward does either, since the filling sits between finished layers rather than going into an oven.
- The eggs are never cookedRaw whites go directly between the layers and are eaten as they are. Egg white can carry Salmonella, and beating and sugaring it does nothing to reduce that. Unlike a meringue topping that is baked or a boiled icing where hot syrup is poured into the whites, this filling has no heat step at all.
- It sits at room temperatureA filled layer cake is typically left out for hours before serving. A moist, low-acid, protein-rich layer held at room temperature is the condition under which the risk grows rather than stays put, and the orange juice here is nowhere near acidic enough in proportion to change that.
- Who is most at riskUncooked egg is a particular hazard for children, older adults, pregnant women and anyone immunocompromised — which is to say much of the audience for a cake at a family supper table.
- It also will not holdFour tablespoons of sugar and the juice of a whole orange are unlikely to stabilise three whites. The added liquid slackens the foam, and a filling of this kind can be expected to weep and slide within an hour or two.
- What the original assumes"Beaten to a froth" in nineteenth-century recipes generally suggests a soft, loose foam rather than the stiff glossy peaks of a modern meringue -- a weaker structure still. "Rind" here is most likely the grated zest rather than the white pith.
- If you want this flavourUse a current recipe for an orange filling built on a cooked base — a boiled or Swiss-method icing, or a stovetop orange curd — rather than adapting the timings and quantities above.
Uncooked egg-white icings run through American and British household cookery of the later nineteenth century, and appear in many community and family compilations of the sort this book belongs to. They needed no thermometer, no sugar boiling, and no fuel, which mattered in a kitchen where the range had already been fired once for the cake itself. Citrus -- lemon and orange -- was a common flavouring, the zest carrying strongly without adding much liquid.