Fish them out as they pop their skins so they don't pick up the soda soapiness, and drop them in a bowl of cold water to rinse. After two or three minutes, scoop the remainder into another bowl of water to cool them down. Peel them by gently squeezing on the thick end of the bean, if necessary nicking the thin end with your fingernails.
McGee says more than half the beans pop out of their skins while in the water, and the rest are easier to peel than usual. He isn't surprised by this effect — alkaline substances such as baking soda break down the structure of plant walls — though he does wonder why it isn't a more common practice in the kitchen. Maybe now it will be!
Read more: Peeling fresh fava beans with ease (and soda) at Curious Cook
Do you have any tips or techniques for easier fava bean peeling?
(Image: Kathryn Hill)