Whenever we're in Spain, we try our best to have horchata de chufa at least once. This summery drink is often translated into English as "tigernut milk." It would be more accurate to call it a "tigernut milkshake." A proper horchata de chufa is slightly thick, and always served very cold. It's a drink for hot weather. The taste has been compared to almonds and hazelnuts. The truth is there is nothing quite like horchata de chufa.
Horchata de chufa is a specialty of Valencia, but it can be enjoyed all over Spain. Before Coca-Cola and other mass-produced sodas became popular, horchata de chufa, along with lemonade and orangeade, where the soft drinks for hot weather.
La Tienda sells chufa nuts if you'd like to try to make your own horchata. They also have a good recipe for horchata de chufa.
To be honest, horchata de chufa is a bit of trouble to make at home. You have to soak the chufa nuts overnight, then grind them (a food processor works well), then soak them again, and strain and squeeze out the milk. You stir in sugar and sometimes cinnamon. Then the chufa milk must be chilled and stirred, to keep it from freezing, like ice cream. For this reason, bars in Spain with really good horchata de chufa have machines that stir the horchata constantly but keep it freezing cold--just like an ice cream machine . I find that without the machine--or laborious stirring over salted ice--horchata de chufa just isn't what it should be.
The on-line Spanish food store La Tienda sells a good brand of bottled horchata de chufa. Esperanza, my mother-in-law, tells me that these bottled horchatas can be quite good, but she also says that there is nothing like a freshly made horchata de chufa. I usually just wait until we are in Madrid or, better yet, Valencia and enjoy as many horchatas as I can.
There is a third option (and one not often mentioned): you can simply munch chufa nuts as an informal tapa.
Go into just about any shop selling dried fruits and nuts in Spain and you will see chufa nuts alongside almonds, hazelnuts, dates, and walnuts. Chufas are enjoyed in a similar way--just something to munch on, either for the merienda (late afternoon snack) or as an appetizer before the comida.
To enjoy chufa nuts as a snack, you only need to soak them 24 hours. Change the water a couple of times, drain them, pat them dry, and they are ready to eat.
Here's a pic of dried chufa nuts (before soaking):
And here's a pic after they've been soaked 24 hours:
The taste of a chufa nut is similar to a raw nut, but its texture is closer to that of a crisp raw carrot (and requires a similar amount of chewing). Sometimes I will toast reconstituted chufa nuts in a little olive oil and salt. This takes the edge off the raw-nut flavor, but the texture remains much the same.