Infuse bourbon with Serrano peppers (instructions follow). Place all ingredients in a blender and blend on high until the ice is pureed. Serve immediately.
*Serrano-infused Makers Mark® Bourbon: 2 cups Makers Mark® Bourbon and 1 piece Serrano pepper, cut in half and de-seeded. Combine the pepper and Makers Mark® Bourbon in an airtight container and allow it to macerate until ready to serve. Store in the fridge and shake container gently twice a day.