adapted from Laura Chenel; serves 4–6
Have a large bowl of ice water at hand. Bring a saucepan of water to boil and add a scant tablespoon of salt. Add the green beans and blanch until just barely tender, 3–5 minutes. Drain the beans and immediately place them in the ice water bath to stop the cooking and preserve their beautiful green color. Let the beans stay in the ice water a few minutes, then drain and dry on a clean kitchen towel.
Mix or shake ingredients in a jar.
Toss the beans with the olives and your desired amount of vinaigrette. Crumble the feta in large pieces over the beans and toss very gently. Serve or store in refrigerator until ready to serve. This salad is best served the day it is made, but keeps nicely up to 2 days.