In a shaker, combine all ingredients with ice (excluding garnish). Shake well. Fine strain into a rocks glass with over a large cube. Garnish with lemon & peach slice.
*Mezcal Peach Syrup
Remove pits from 2 ripe peaches and cut into half-inch cubes. Pour 2 oz mezcal into a saucepan and place on medium-high heat. Add cubed peaches and 3 oz of agave or simple syrup to the pan. Bring to boil for 5 minutes and then reduce to a simmer for another 15 minutes. Remove from heat and let cool. Add mixture to a blender with 4 oz of peach nectar and purée until smooth.
