Soaking syrup (Сироп для промочки) is a GOST recipe for a light sugar syrup used to moisten sponge cake layers before assembling layered cakes. Soaking adds moisture, sweetness, and flavor to baked cake layers that might otherwise be too dry after baking. This is one of the most essential semi-finished products in cake production.
Recipe per 10 kg
- Granulated sugar (TS 99.85%) — 3.500 kg
- Water — 6.500 kg
- Flavoring (vanilla, rum essence, or cognac essence) — 0.020 kg
Technological map
Sugar is dissolved in water and brought to a boil. The syrup is boiled for 1–2 minutes, then cooled to 20–25 °C. Flavoring is added after cooling — typically vanilla essence for neutral cakes, or rum/cognac essence for richer formulations. The syrup is applied to cake layers by brushing, spraying, or brief dipping.
Total solids: approximately 35–50% depending on the recipe and the type of cake being soaked. Lighter sponges require a thinner syrup to avoid becoming soggy, while denser cakes can absorb a more concentrated solution. The syrup should be at room temperature when applied — hot syrup can damage the cake structure. Shelf life of the prepared syrup: 5–7 days at 4–6 °C.