Method
Prepare the Glass: If you want to add a salt rim, rub a lime wedge around the rim of your martini glass, then dip it into salt to coat.
Infuse the Jalapeño: In a shaker, muddle 1-2 slices of jalapeño with the agave syrup. This helps release the jalapeño's heat and flavor. If you prefer a milder drink, start with one slice and taste before adding more.
Mix the Cocktail: Add vodka, fresh grapefruit juice, and lime juice to the shaker with the muddled jalapeño. Fill the shaker with ice.
Shake It Up: Secure the lid on the shaker and shake vigorously for about 15-20 seconds, until well chilled.
Strain and Serve: Strain the mixture into the prepared martini glass. If you prefer a smoother drink, double strain it using a fine mesh strainer to catch any jalapeño bits.
Garnish: Add a slice of grapefruit or jalapeño to the rim for garnish.
Variations
Spicy Grapefruit Margarita: Substitute vodka for tequila, and use orange liqueur instead of agave syrup for a margarita twist.
Grapefruit Basil Martini: Swap jalapeño for fresh basil. Muddle basil leaves in the shaker before adding the other ingredients for a refreshing herbal note.
Fruit-Infused Version: Add muddled strawberries or pineapple for a sweet touch.