Bring a pot of water to a boil. Blanch the green beans for 2 minutes. Drain. (No need to shock them in cold water.)
Heat a dry wok or large skillet over medium-high heat, and add the oil. When the oil is shimmering, add the green beans, and let them fry until they begin to scorch and wrinkle, about 2 minutes. Lower the heat to medium, and add the water, garlic, and salt to taste. Stir-fry for 1 minute, just until the garlic turns golden. Serve!