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Orange Frosting
Grated rind 1 orange 1 teaspoon brandy ½ teaspoon lemon juice 1 tablespoon orange juice Yolk 1 egg Confectioners' sugar Add rind to brandy and fruit juices; let stand fifteen minutes. Strain, and add gradually to yolk of egg slightly beaten. Stir in confectioners' sugar until of right consistency to spread.
This is an uncooked frosting built on a raw egg yolk, and nothing in the method brings it to a safe temperature. The notes below explain the problem and the period details rather than offering a way around it.
- Raw yolk, never heatedThe yolk is only "slightly beaten" and then thickened with sugar; no stage of the recipe applies heat. Salmonella in shell eggs is an interior risk, not just a shell-surface one, and a frosting like this sits at room temperature on a cake for hours, which is the condition the bacterium favours. A current recipe for an orange icing should be used instead.
- The teaspoon of brandy does nothingA single teaspoon of spirit diluted through the juices and the sugar gives an alcohol concentration far too low to have any preserving or sterilising effect. It is a flavouring here, and was intended as one.
- "Confectioners' sugar" in 1896The term then covered a range of finely ground sugars, which did not necessarily include the cornstarch anti-caking agent standard in today's powdered sugar. Where that starch is absent the sugar takes up liquid differently, so the quantity implied by "until of right consistency" may not be directly comparable.
- No stated quantity at allThe sugar is given only as a consistency instruction. It means the recipe cannot be scaled or costed as written, and gives no yield.
- Why the rind steepsFifteen minutes in brandy and acid juice draws the oils out of the zest, and the straining removes the solids so the frosting stays smooth. That extraction step is the sound piece of technique in the recipe, and it works in any orange icing.
- Grated rind, then and nowThe instruction to strain suggests the rind came off in noticeable pieces rather than as the fine shreds a modern rasp produces, which would ordinarily be left in.
Uncooked or "water" frostings of this kind fill several pages of Fannie Merritt Farmer's Boston Cooking-School Cook Book alongside boiled frostings, and the two families reflect a real division in period kitchens: boiled frosting needed a reliable heat source and a cook confident about sugar stages, while an uncooked one needed only a bowl and a spoon. The egg yolk here is doing the work of an emulsifier and a colourant, giving the icing body and a deeper orange than juice alone could. Brandy appears constantly in Farmer's flavourings; that the book calls for it so casually is a reminder that the volume predates Prohibition by more than two decades. Farmer is often credited with popularising the level measurement, standardised throughout the book, which makes this recipe's vague "until of right consistency" a small survival of the older, looser way of writing things down.