paper 0-8165-1961-7 The Last Tortilla ($40.00; paper $17.95; Sept. 3; 240 pp.; 0-8165-1960-9; paper 0-8165-1961-7). A debut collection of 13 stories dealing with El Paso’s often impoverished, invariably feisty Mexican-American populace. Troncoso’s immensely lifelike characters include “Tuyi, the fat boy everybody ignored,” in an unusually inventive coming-of-age tale (“The Snake”), an elderly grandmother (“The Abuelita”), whose undimmed zest for life implicitly rebukes her grandson’s scholarly pessimism, and a college student aglow with memories of the older Mexican woman whose “unabashed Bohemian warmth” sweetly overpowered him. Though sometimes slightly overexplicit, Troncoso’s wistful, endearingly romantic tales vividly dramatize the inherent richness of even subsistence-level lives. He’s a respecter of persons, and in turn his characters earn your affection and respect.