Finely chop the verbena leaves. Pour the cream into a saucepan, add the lemon verbena, and bring to scalding. Remove from the heat, cover, and set aside to infuse for 1 hour.
Pour the milk into a bowl and sprinkle the gelatin powder over the surface. Let stand until softened, 10 to 15 minutes.
Add the sugar to the lemon verbena cream and heat, just un