NYT Cooking: Horchata, a sweet cinnamon drink popular throughout Latin America, is typically made by soaking white rice in water, straining the solids, then sweetening the liquid with sugar and cinnamon. But the horchata at Guisados, a chain of taco restaurants in Los Angeles, is different. It's made with whole milk and is served plain, or “dirty” with a shot of cold brew concentrate — and the chain sells u...