Answer: It sounds like a dry shelling bean to me, quite possibly Canavalia gladiata, or Sword Bean. The flat pods commonly grow 15" long and each pod contains 5-10 reddish seeds. The shape of the slightly curved pod resembles a sword. Sword bean is a viny perennial native to tropical Asia. If this doesn't describe your plant, it could be a standard shelling bean; either Cranberry or Mexican Pink. Both are great in soups or casseroles. Just for future reference, eggplant leaves typically have a slightly scalloped edge and, as members of the Solanum family, have star-shaped flowers. Enjoy your surprise harvest!
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