The name of bar manager Eben Freeman's drink refers to Bohemia, the region of the Czech Republic that traditionally produced the bitter liqueur called Becherovka. Becherovka is flavored with a secret blend of herbs and spices.
Fill a cocktail shaker with ice. Add the tequila, mezcal, lemon juice, orange juice, Simple Syrup and Becherovka and shake well. Strain into an ice-filled rocks glass and garnish with the flamed orange twist.