I've never actually cooked up a batch of dry bean pods but just by looking at and feeling some of the pods of certain dry bean varieties I can tell that there are some that would be pretty good. Probably be best to be ready for a different sort of snap bean texture and flavor though.
Rio Zape sure would be an interesting, (it is not an early variety), one to try. Rio's pods are soft and fuzzy and colorful. They have definite dark strings which make what I'd call a stringy creaseback. The flesh of the pod is not as thick as beans bred for snap but is thicker than most typical dry bean pods, and they fill up nicely with beans that I know are flavorful.
I just used Rio Zape as an example because I'm thinking of trying some to make a small batch of plain boiled green beans with. There are a lot of other dry bean varieties that have nice edible looking pods. Dapple Grey is making pods that are thick, juicy, and heavy. At most stages they feel soft. At their bone dry stage for harvesting dry beans from, they are very leathery, and do a kind of tightening up.
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A variety called Wren's Egg, a bush bean that is relatively quick to produce, is what I call a true multipurpose bean. Oh, and really pretty too. Wren's egg should be in a group called BORLOTTI or HORTICULTURAL. They make a nice sized plump rounded dry bean that when harvested bone dry is soft white with a shade of red splashed markings all around it. If harvested for shell beans they are bright white, with pinkish red markings, and they have a mild flavor with a touch of that "sharpness" when eaten raw. Real good as shelly. The actual pods for eating are real nice. Super colorful. They are green at first. That'd be when you want to pick them for pod eating. (Unless you go for Beans n Bacon with the pods more developed to get more protein.) I think mine will be making another flush of production. If so I'm gonna make a batch.
Stringing beans is almost always a good idea. It is an old common family tradition that was mostly lost about the time tv came along.
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Yep Mackay, there are a good number of varieties you can grow, and yes, starting indoors extra early works. Super careful with the roots. I used to grow dry beans in Dillon and Twin Bridges Montana, barely zone 4. A typical grow season would be June 15th to September 1st. But then I got good at stretching the season at the early part, and nature started helping at the late part by letting the season end later each year. 2007 lasted to sometime in October.