Buy Real Natural Oak Acorn Flour made from Acorns. Sold in 1 pound bags. Acorn flour is made using the finest freshest white oak acorns. The high price of acorn flour is due to the process of peeling acorns by hand, leaching the acorns of tannins, grinding and drying the flour. The entire process is done by hand and can take 5-7 days to prepare 1 pound of acorn flour. Natural acorn flour - made with natural oak acorns only! Acorn flour is gluten free.