Quick Answer
White oak acorns, specifically those from Quercus alba and Quercus robur, are the most suitable for flour production due to their higher tannin content and less bitter flavor. Red oak acorns, such as Quercus rubra, are another option but may require additional processing to remove excess tannins.
Selecting and Processing Acorns
When selecting acorns for flour production, look for varieties with a higher fat content, as this will contribute to a more palatable and nutritious flour. Aim for acorns with a moisture content between 15% and 25%, as this will facilitate easier drying and processing. Sort and clean the acorns, then remove the caps by hand or using a simple tool to avoid damaging the nut.
Leaching and Drying
To remove excess tannins and achieve a palatable flour, leach the acorns in water for 24-48 hours, changing the water every 8-12 hours. Aim for a 4:1 water-to-acorn ratio to minimize tannin extraction. After leaching, dry the acorns using a food dehydrator or a low-temperature oven (150°F - 200°F) to a moisture content of 10% or below. This step can take 6-12 hours, depending on the equipment and ambient temperature.
Milling and Storage
Once dry, the acorns can be milled into flour using a grain mill or a high-speed blender. To minimize oxidation and preserve the flour’s nutritional value, store it in a cool, dry place (less than 60°F and 60% humidity) in an airtight container. Aim for a storage life of 6-12 months, depending on the storage conditions.
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