Rim your shot glass with Tajin.
Fill a large bar shaker with ice.
Combine tequila, Watermelon schnapps, lime juice and hot sauce into the shaker.
Shake it up really good for about 15 seconds.
Strain mix from the shaker into a small glass that is already rimmed with Tajin.
Garnish it with a lime wedge or piece of watermelon candy.
Enjoy!