OSD + WBS Hydrated Grain Recipe
Ingredients & Ratios
| Ingredient | Unit | Amount | % of Total* |
|---|---|---|---|
| OSD | oz | 3 | 9.9% |
| WBS | oz | 12.2 | 40.4% |
| Sugar | tsp | 1/4 | trace |
| Water | oz | 15 | 49.7% |
| Total | oz | ≈ 30.2 | 100% |
*Percentages are approximate, based on total mix weight; sugar mass is very low and treated as trace.
Estimated Hydration: 15 oz water ÷ 30.2 oz total ≈ 50% moisture
Suitable as a pre-conditioned grain + sawdust mix prior to full sterilization.
Suitable as a pre-conditioned grain + sawdust mix prior to full sterilization.
Method
- Weigh out 3 oz OSD and 12.2 oz WBS into a large, high-temp rated bag.
- Add 1/4 tsp sugar to the dry mix.
- Pour in 15 oz water and mix thoroughly so the OSD and WBS are evenly hydrated and there is still some free water in the bag.
- Vacuum-seal the bag for about 10 seconds while free water is still visible. The bag is large enough to handle a 10-second seal — possibly a little longer; you can try 12 seconds next time if the seal looks solid.
- Place the sealed bag into a sous-vide bath and hold it at your desired conditioning temperature for the planned time.
- After the sous-vide step, allow the bag to cool enough to handle safely.
- Run your usual sterilization cycle (e.g., pressure sterilizer/autoclave), using your standard time and temperature for grain spawn.
- Let the bag cool completely to room/inoculation temperature, then inoculate under clean conditions according to your normal workflow.
ℹ Process Notes
Mixed together in one bag and vacuum-sealed for 10 seconds while there was still free water present. The bag is large enough to handle a 10-second seal — maybe even a little longer; try 12 seconds next time.
The purpose of the sous-vide step prior to sterilization is twofold:
- To hydrate the grain/OSD, serving as a substitute for the traditional overnight soak.
- To lightly sanitize the grain before the full sterilization process.