Usucha , or thin tea , is prepared with half a teaspoon of matcha and about 75 ml ( 2.5 oz ) of hot water . Usucha , or thin tea , is prepared with approximately 1.75 grams ( amounting to 1.5 heaping chashaku scoop , or about half a teaspoon i.e. level teaspoon ) of matcha and approximately 75 ml ( 2.5 oz ) of hot water per serving , which can be whisked to produce froth or not , according to the drinker 's preference ( or to the traditions of the particular school of tea ) .