I have done a little dabbling in pea breeding and got a pea with red pods, just right at the end of the season. Fingers crossed for seeds, it is getting very mildewy here.
First photo is how the pea pod starts to form, mostly yellow with just a little red, later the red colour spreads over most of the pod. The variety is a mangetout, but I don't know whether the red pod colour stays the same after cooking. This is a very late plant and there won't be any tasting, just hope I can get a few seeds.