Edamame is one of my favourite Japanese snacks. You can buy them frozen in some supermarkets and most Asian markets. They're full of nutrition and relatively cheap to buy.
Put them in a saucepan of boiling water for only a few minutes, then remove from the water and season with salt.
How to eat:
Using your fingers or teeth pop the soya beans out of the pod and eat. Do not eat the outer pod.
They are a healthy substitute for crisps and go really well with beer/wine.