June 24 is the Nativity of Saint John the Baptist, the traditional day to harvest green walnuts for making nocino, a delicious liqueur invented at a congress of witches, according to Anna Tasca Lanza, the doyenne of Sicilian cooking. Lanza's witches were Italian, but other countries from Croatia to France to the chilly Teutonic regions equally claim greenwalnut liqueur as their own. I learned to make it at the Institute of Domestic Technology, a cooking school in Altadena, California, where I also teach.
When you harvest the nuts—working barefoot, according to some folklore—they are smaller than eggs, smooth to the touch, and crisp like apples, because the shells have not yet hardened. The nutmeats, at this stage, are jelly.
Like most liqueurs, nocino is easy but requires patience. You slice the nuts and cover them with strong booze, sugar, and spice, and allow the mixture to infuse for forty days, until it is nearly black. The real test of patience begins after you bottle it. Ten-year-old nocino is said to be the best, and certainly you would never drink this summer's batch before cold weather sets in this fall. Mature nocino has a complex flavor of nutmeg, allspice, coffee, and caramel. Drink it neat as a digestif, or use it to flavor desserts. A few tablespoons of nocino lightly whisked into a cup of heavy cream will cause it to seize, as if magically transformed into cooked custard. The thickened cream is called "posset," and can be used as a sauce alongside cakes or other desserts.
My nocino recipe is based on those from the Institute of Domestic Technology and Lanza's Sicilian cookbook The Garden of Endangered Fruit. Its fundamentals are green walnuts, 80-proof grain spirits, and sugar. (My secret ingredient is coffee beans.) You can change the aromatics if you like, but use small quantities, because the spices can take over. Green walnuts are sometimes available at farmers' markets, or can be ordered online at www.localharvest.org.
