Watermelon Martini

Ingredients

• 1/4 cup sugar
• 1/4 cup kosher salt
• 6 oz fresh watermelon juice 
• (I used a seedless watermelon so mixed it in my food processor and then strained it through a metal strainer).
• 2 & 1/2 oz good vodka
• 2 & 1/2 oz Limoncello or orange liqueur