A simple riff on an Old Fashioned using Reposado Tequila, Agave Syrup, Grapefruit, Jalapeño and Bittered Sling's Kensington Market Bitters
Cut a small slice of Grapefruit (about 1/2 inch) and add it to your Mixing Glass, along with the rest of the ingredients.
Fill the Mixing Glass 3/4 of the way with ice, and stir until well chilled (approximately 45 seconds)
Double Strain over 1 large ice cube and garnish with Grapefruit Zest.
Remember, if you don't have Bittered Sling's Bitter, substitute this with Angostura bitters.
Also when it comes to spice, adjust it to your preferences. I start off with two thin slices so it doesn't overwhelm the cocktail, but if you like a ton of heat, you can always add more.