FOOD STUFF; A Salsa How-To Meets A New Tequila

By Florence Fabricant for The New York Times

The Mexican women who study English at the Anderson Valley Adult School in Boonville, Calif., inevitably wind up talking about food. Now, 25 of their salsa recipes have been turned into a charming little bilingual cookbook, ''Secrets of Salsa'' or ''Secretos de la Salsa'' to benefit the school. The book, $14.95, was published by Chelsea Green in Vermont. Its recipes are simple and straightforward. From