Runner beans are native to Central America, and in that region they have been cultivated and eaten for more than two millennia. Runner beans and their seeds are quite nutritious; they're a healthy source of vitamin C and other essential nutrients. But gardeners also love runner beans because they are easy to plant and they grow quickly. Whether buying or harvesting your runner beans, look for mature beans that have better-developed seeds.
Wash the bean pods thoroughly.
Use a small knife to remove the stringy portion that runs the length of both sides of the pod.
Harvest the seeds, soak them in water for four to five hours, and eat them raw.
Boil (for 5 to 10 minutes) or steam (8 to 12 minutes) the runner bean pods, then harvest the seeds.