Heat 1 Tablespoon oil in a skillet over high heat. Add cabbage and 1 Tablespoon water. Stir fry for 30 seconds.
Remove cabbage from skillet and place on a serving platter.
Heat the remaining 1-1/2 Tablespoons oil in the skillet over high heat. Place the garlic and shrimp in the skillet and stir fry until garlic is lightly browned and shrimp turns pink. Add pepper flakes, onion, cilantro, soy sauce and remaining water to the skillet.
Stir-fry for 10 seconds. Pour the hot mixture onto the cabbage.