Steam or boil the edamame. If using frozen edamame pods, bring a small pot of lightly salted water to a boil. Add the edamame pods and cook for 5–7 minutes until bright green and just tender. Drain well and set aside. If you prefer them simply steamed, place them in a steamer basket over simmering water for 5–6 minutes. Once drained, season immediately with a pinch of salt and a generous sprinkle of chilli flakes while they're still warm so the seasoning sticks.