Heat water until just before boiling (small bubbles forming, not a rolling boil).
Rinse fresh herbs thoroughly.
Rough chop the lemon balm to release oils.
Slice the lemon and squeeze one slice into the pot; add the rest for infusion.
Prepare the ginger (slice or grate as needed).
Place lemon balm, lemon slices, ginger, mint leaves, and cayenne in a steeping container.
If using a green tea bag, add it now.
Pour the hot water over the ingredients and stir lightly.
Cover and steep for 10-15 minutes.
Strain into a cup or jar.
Add sweetener if desired and enjoy warm or cold.