It's Beginning To Smell A Lot Like Christmas!
Fill a saucepan two-thirds of the way with water. Add lemon slice and five or six springs of rosemary. If you don't have fresh, you can use rosemary leaves - start with about three tablespoons and add more if you can't smell it enough. Two tablespoons of vanilla complete your aroma profile.
Simmer for as long as you want - it will last all day - but don't leave it unattended. Then just cover it overnight and use it for one more day.