Even though she is not a native, Jean Anderson knows the food of Portugal. Falling in love with the country upon her first visit, she has returned more than 80 times. This book, winner of the "Best Foreign Cookbook of the Year" award, is the result of years of research, and hours spent in the kitchen. It is sure to please the palates of tourists interested in Portuguese food and of Portuguese emigrants in search of that authentic taste of home.  (PGL10, $19.95)