Pour 2 to 5 g (up to 2 teaspoons) of matcha powder into a bowl.  Add a small amount of hot water (about 2 ounces at 175°F/80°C) to the matcha powder.  Whisk vigorously in a zigzag motion using a bamboo whisk (chasen) until the matcha is frothy and completely dissolved.  Pour the matcha into a cup and enjoy as is, or add water or milk for a lighter or creamier drink.