1 serrano sliced in half, seeds removed
1-2 cups sugar
1 tsp salt
1 cup tequila
1/3 cup fresh lime juice
1/2 cup Cointreau
In a saucepan add watermelon juice, serrano, salt and 1 cup sugar. Steep over low heat until sugar dissolves.
Taste and add more sugar to your preferred taste.
Remove chile, add to pitcher and allow to cool. Place in fridge to cool until ready to use.
On a small plate spread salt. With lime wedges moisten rim of 6 ounce glasses. Dip glasses into salt. Place glasses into freezer to chill.
In a pitcher add to the watermelon juice the tequila, lime juice and Cointreau. Remove glasses from freezer and serve margarita mixture over ice. Garnish with lime slices.