1 rinse of Mezcal (or Tequila)
2 oz of Reposado Tequila (or Tequila)
3/4 oz of manzanilla sherry (or fino sherry)
1/2 oz of St Germain (or Elderflower Cordial)
1 dash of orange bitters
1 slice of Grapefruit
Rinse a chilled double rocks glass with the mezcal; discard the excess. Fill a pint glass with ice. Add all of the remaining ingredients except the twist and stir well. Strain into the prepared glass, pinch the twist over the drink and discard the twist.