To Make the Spicy Agave Syrup: In a medium saucepan, combine the water, jalapeños, navel orange zest, mint, and salt. Cover and bring to a boil, then immediately reduce to a simmer. Cook 15 minutes, then strain syrup into a measuring cup. Mix in twice as much light amber agave as water and reserve for use.
Measure all cocktail ingredients in a cocktail shaker. Add 5 ice cubes and shake for 8 seconds. Strain into a rocks glass with fresh ice and garnish with a cucumber wheel.
PRO TIP: Peel and cut tips off cucumbers before juicing them in a centrifugal juicer.