gluten-free, soy-free, oil-free Horchata is a traditional Mexican beverage made with homemade rice milk, cinnamon and sweeteners. Iâve taken liberties with it here by adding in oats and almonds. Itâs amazing served over ice and is the perfect drink for a hot summer day. I have to admit that I went through my first batch in a dayâit is just that good. Consider yourself warned. Maybe go ahead and make a double batch.