Real black beans, especially prepared Cuban style are delicious. The dehydrated black beans, not so much. In fact, I really don't like any commercial dehydrated bean product I've tried. Homemade is good, or use a bean that cooks quickly like Masoor Dahl, Chana Dahl, or good quality lentils.
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If I wouldn't eat it at home, why would I want to eat it on the trail?