If you’re lucky, horchata will be listed as one of the beverages on your menu. Unfortunately, many Mexican restaurants find it easier to only offer an “authentic” bottled beverage, like Jarritos soda / pop.
Horchata is a sweet, rice milk drink that is flavored with vanilla and cinnamon. Those with dairy allergies should beware, though; milk is one of the ingredients in the recipe.
You could go to the organic or health food section of the grocery store and purchase a carton of rice milk, or just make your own from water and rice.
4 cups water
1 c raw white rice grains
1/3 c milk
1/2 T ground cinnamon
1 t vanilla
Pour 4 cups water and 1 cup rice into a blender. Blend the mixture for about 30 seconds. Let this mixture set for at least 3 hours. Strain the liquid, and discard the rice. Add milk, cinnamon and vanilla. Mix these well. Refrigerate the horchata until chilled. Serve with or without ice.