1 Watermelon (sliced)
1⁄4 oz Agave syrup (1 part agave nectar, 1 part water)
1 1⁄2 oz Silver Tequila (preferably aged to remove the harshness)
1⁄2 oz Lime juice
In a shaker, muddle the watermelon and agave syrup.
Add the remaining ingredients and fill with ice.
Shake well and double strain into a chilled Martini glass.
Garnish with a watermelon slice.