A quick search found that it was horchata that we found so delicious, with strawberries added to the mix. You may already be familiar with it but I'll include the recipe here in case others want to try it.
Ingredients
6 cups unsweetened rice milk
½ cup sugar
1 ½ teaspoon ground cinnamon
1 vanilla bean or 1 teaspoon of vanilla extract
Throw that into a blender along with the optional strawberries and pour over ice.
I wouldn't have thought to mix strawberries and cinnamon, but it ends up they go pretty well together.