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How to make flour
Obtain your grains, seeds, nuts, beans...something to grind to a pulp.
Practically any grain, nut, or seed can be turned into flour. Try exotic items such as quinoa, popcorn, acorns, and peas to the more traditional options like rice, wheat, oats, and barley.
Fresh, whole wheat berries, rye berries, whole oats and the like can often be found at health food stores, sold in bulk. They'll be white, russet, purple or amber-colored.