To rim the glass:

1. Pour the lemon juice onto a small plate.
2.  Pour the monkfruit onto a separate small plate.
3. Swirl the rim of a martini glass in the lemon juice, then swirl it in the monkfruit to coat the rim.

To make the cocktail

1. Put the lemon wedges, monkfruit, lemon juice, and water into a cocktail shaker. Muddle until the lemon wedges are crushed and have released their juices.
2. Add the tart cherry juice and vodka to the shaker and fill with ice. Cap and shake vigorously.
3. Strain the mixture into the rimmed martini glass and garnish with a lemon.