Some may shy away from an avocado shake because they cannot imagine avocado served in a fruit drink. I encourage you to take the leap into enjoying the wonder of avocado the way the Vietnamese see and appreciate it. An avocado sinh to (fruit shake) is served in most bakeries and coffeehouses in Little Saigon. It is rich, creamy, sweet, and filling. Condensed sweetened milk is the ingredient of choice, but you can substitute coconut milk and sugar for a different taste.