Is bur oak acorn edible

Answer 1

The only truly "sweet" oak, without bitterness, is burr oak Quercus macrocarpa from the area of the Great Lakes in America. It is sometimes planted in European parks (in Poland in Wilanów and Krasiczyn). Selected specimens of practically all species were found to be without, or nearly without, bitterness. You are very likely to find nicely tasting acorns of such southern European species as Quercus pubescens or Quercus ilex. For some native tribes of California acorns were the most important food. They built giant raised baskets where they stored their crops. Pauites kept acorns in holes walled by sage leaves. Some natives such as Cowlitz and Paiute kept acorns for years, buried in boggy ground. They turned black but were still perfectly palatable.

Reference

http://www.luczaj.com/ang_jadalne.htm