Step 1

Place tequila and jalapenos in a small bowl. Let stand 2-3 hours.

Step 2

Using water, moisten the rims of four margarita or cocktail glasses. Mix salt and sugar on a plate; hold each glass upside down and dip rim into salt mixture. Set aside. Discard remaining salt mixture on plate.

Step 3

Strain tequila into a small bowl, discarding jalapenos. Stir in grapefruit juice and simple syrup. Serve in prepared glasses over ice.