When you have fresh fava beans at hand, they really don't need much adornment; in most cases, less is more. Here's a simple preparation that's delicious served at room temperature on a bed of butter lettuce, or as an accompaniment to grilled meat or fish.
Bring a large pot of water to a boil and cook the fava beans for 1 minute, or until tender. Drain immediately and plunge the favas into a bowl of ice water to stop the cooking. When cool, drain again. Slip the skins from the fava beans, discarding the skins.
In a small bowl whisk together the walnut oil, lemon zest, lemon juice, salt, pepper, and mint. Add the fava beans and toss to coat.
To serve, line each salad plate with a leaf of lettuce. Divide the beans among the plates and serve at room temperature for best flavor.