Is grilling your cocktail ingredients about to be the trend of the summer? ​ We certainly think so! Shake up this fruity treat this #MargaritaMonday​ --​ The Grilled Watermelon Margarita​ ​ 1 oz Cointreau​ 2 oz tequila​ 1 oz fresh lime juice​ 0.5 oz grilled watermelon syrup​ 0.5 oz fresh grapefruit juice​ ​ Step 1​ To make grilled watermelon syrup: Cut watermelon into slices and grill until both sides have grill marks.​ ​ Step 2​ After letting cool, blend with simple syrup (1:1) and fine strain.​ ​ Step 3​ Add all ingredients to shaker with ice.​ ​ Step 4​ Shake and fine strain over ice into Tajin-salted rocks glass (3:1 ratio of Tajin to kosher salt).​ ​ Step 5​ Garnish with lime wheel.​