I assume the question relates to winter squash, not summer squash. That being the case, check out the web site: http://www.ehow.com/how_4451716_make-pumpkin-flour.html
that describes how to make pumpkin flour. Briefly, pick out a pumpkin/squash, cut it open to remove the seeds and any stringy material, cut away the skin, slice the remaining pumpkin/squash into small pieces, dehydrate the cut up pieces in a dehydrator or oven at low temperature, and finally mill the dried up pieces in a blender to make the flour. Store the flour in a well sealed container.
I do not know how well the process works for different types of winter squash but I would suggest using a Hubbard squash or perhaps a Boston Marrow as they are reportedly good substitutes for making pumpkin pie. This suggests the flour made from those types of squash would be comparably decent.
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