What are peans?

I have peans growing at the moment. They grow just like a runner bean. I love picking them and munching on them while still in the garden. You immediately get that pea taste follwed by a bean taste, I have not shelled them and used them like peas (yet) - but I pick them young, slice them (big slices) into half a dozen pieces and cook like a bean. They have no strings like runner beans do. And they are very vigorous growers. I will be keeping some seed for next year