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Boil till it threads. Flavour with vanilla and pour on buttered pan.
This is a fragment — the tail end of a boiled sugar candy whose ingredient list and quantities sit elsewhere on the page. What survives is the part that governs success, so it is worth reading closely even though it cannot be followed on its own.
- What is missingThere is no ingredient list, no quantity and no pan size here. Any sugar syrup boiled to the thread and poured out to set will behave as described, but the proportions have to come from a complete recipe.
- "Threads" is a temperatureModern candy charts put the thread stage at roughly 223-235F (106-113C): a spoonful lifted from the syrup falls in a fine thread rather than in drops. It is the softest of the sugar stages, and syrup taken only this far stays soft and sticky rather than setting hard, so an older recipe that says "threads" may well intend a stage further on than the modern chart.
- The thread stage is easy to overshootSoft ball begins at about 235-240F, and syrup carried that far will set noticeably firmer. A few degrees decides the texture, so a thermometer is a help here.
- Add the vanilla off the heatVanilla extract is alcohol-based and both the alcohol and the aromatics flash off in boiling syrup. Pull the pan from the burner, let the bubbling subside for a moment, then stir the flavouring in.
- Do not stir the boiling syrupAgitation and stray crystals on the pan wall seed graininess. Wash the sides down with a wet pastry brush during the boil and leave the syrup alone until it comes off the heat.
- Buttered panA shallow rimmed sheet or a square cake tin, buttered generously while cold, not oiled with a spray. Marble slabs were used by confectioners and by some home cooks; a cold, heavy sheet pan does the same job of stopping the pour before it runs thin.
- CuttingScore soft candy while it is still warm and pliable, then break along the lines once cool. Waiting until it is fully set makes clean pieces much harder to get.
Sugar boiling was a branch of home cookery that demanded a measured temperature long before most kitchens owned a thermometer, and cooks learned instead a ladder of named stages — thread, soft ball, hard ball, crack — each identified by how the hot syrup behaved between the fingers or in cold water. Books like the Five Roses collection, published by the Lake of the Woods Milling Company to promote its flour, carried candy sections because home confectionery was a normal winter and holiday occupation in Canadian households, and because sugar had become cheap enough by the early twentieth century to be boiled by the cupful. The extreme brevity of this entry is characteristic of the genre: the compiler seems to have assumed a reader who already knew what a thread looked like and needed only reminding of the flavouring and the pan.