Mary Beth Sheridan details how drug cartels in Mexico have begun extorting tortilla vendors. Stef Ferrari raises a glass to stuzzichini, Italian bites served during aperitivo. LA Times restaurant critic Bill Addison reviews Baroo, which he recently named Restaurant of the Year. Julia Sarreal pores over yerba mate, an iconic South American beverage that has been revered and vilified. Catherine Roberts reports on pesticide residues lurking in 59 common fruits and vegetables.