Assertion: cattail's rhizome | /r/HasProperty | made into protein-rich flour
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Source sentences:
text: Narrowleaf cattail has year-round edible uses: (a) the peeled rhizomes can be cooked like potatoes or dried and made into protein-rich flour which can be added as a thickener for soups; (b) the young spring shoots are juicy with a nutty flavor and can be used as an asparagus substitute; (c) the young immature flowers can be boiled and eaten somewhat like corn on the cob; (d) the base of the leaves can be eaten like an artichoke; (e) the flowers can be eaten raw or cooked.