2 cups seedless watermelon cubes
1 lime wedge
1 pinch kosher salt
1 1/2 fluid ounces silver tequila
3/4 fluid ounce orange-flavored liqueur (such as Cointreau®)
3/4 fluid ounce lime juice
1 thin slice jalapeno slice, plus more for garnish
1 watermelon wedge
Puree watermelon in a blender. Wipe the rim of a margarita glass with a lime wedge; dip rim in salt.
In a cocktail shaker half-filled with ice, add tequila, orange liqueur, lime juice, jalapeno, and 2 ounces of the watermelon puree. Shake until very cold.
Strain into prepared glass. Garnish with watermelon wedge and jalapeno slice.