Cook green beans in a large pot of salted boiling water, uncovered, until crisp-tender, about 6 to 8 minutes. With a wire skimmer or a slotted spoon, immediately transfer beans to a large bowl of ice water. When beans are cool, transfer with a slotted spoon to paper towels to drain.
Return water to a boil and cook edamame until crisp-tender, about 5 to 6 minutes. Drain and transfer edamame to a bowl of ice water. When edamame are cool, drain and transfer to paper towels to dry.
Pat green beans dry and transfer to a large bowl. Pat edamame dry and add to green beans. Stir in chickpeas.
Mince garlic. Using the side of a large, heavy knife, mash garlic and 1/2 teaspoon salt into a paste. Transfer garlic paste to a blender. Add cilantro leaves, serrano chile, lemon juice, olive oil, cumin seeds and cayenne and blend, scraping down sides occasionally, until smooth. Add dressing to beans, season with salt and toss to combine. Let stand at room temperature for one hour to allow flavors to blend. Serve with lemon wedges.
Nutrition information per each of 10 servings:
Calories194Fat11 gSodium176 mg