This recipe can also be used to prepare a purée of fresh or frozen peas. If using frozen peas—which can be excellent—skip the preliminary blanching and simply purée the thawed peas.
Remove the skin from each of the beans. This is best done with a small paring knife or a thumbnail.
Cook the beans for about a minute in a pot of rapidly boiling salted water. Drain the beans in a colander and rinse them with cold running water to cool them.
Purée the beans in a food processor. Thin the purée