Matcha is the soul of matcha cake. If you want to make good matcha cake, you have to use good quality matcha.
Matcha powder has three enemies: heat, light and oxygen. The colour and flavour deteriorate very quickly unless the tea is kept in the cold, in the dark, away from oxygen.
Good matcha is sold in an airtight and lightproof metal container, and it comes with an oxygen absorber. It