Wash water spinach by submerging it in a large tub of water (mixing bowl). Repeat 2-3 times until the water is clear. Then drain. Cut into 3-inch pieces.
Heat a large saute pan on high heat. When the pan is hot, add in oil. Add in minced garlic. Allow to become lightly brown, then add in all vegetables and water. Cover with a lid and allow to steam for 2-3 minutes.
Then remove the lid and stir the vegetables to bring the softened vegetables to the top and place uncooked vegetables on the bottom. Cook with lid covered for another 1-2 minutes.
Then add in miso paste and soy sauce. Mix thoroughly into cooked vegetables. Cook for another minute and then remove from heat.
