Having swallowed up the online Gourmet Guide and foodwine.com, California cook Kate Heyhoe's gastronomical guidebook expands the horizons of would-be gourmands with best recipes (peppermint brownies, anyone?), culinary tips (what Brits call a biscuit, Americans call a cracker), and such useful sections as ''I Love Chocolate'' and ''Pasta, Risotto & You.'' Worth celebrating -- and salivating.