Steep green tea for 1 minute and 30 seconds (not at 100°C, about 80°C, let it cool slightly by transferring to another cup)
Add lemon (cool the green tea with ice or let it chill to below 50°C before adding lemon) or add 2-3 drops of lemon juice
Add a tiny bit of stevia (2.5 spoonfuls, just 1/10 for a slight hint)