Meal replacement powder with unsweetened soy milk: Garu Seonsaeng
Garu Seonsaeng Drinkable Raw Soy Milk Seoritae 99.3 is an unsweetened Korean seoritae powder for mixing into soy milk-style drinks. I tried it in cold water as a quick breakfast substitute; it dissolved after a few stirs and tasted mild, nutty, and not overly chalky.