Add <quantity>1<unit>kg</unit></quantity> of sugar to a pan on low heat

Add <quantity>600<unit>ml</unit></quantity> of water immediately. Stir until the sugar is dissolved

Blend the mixture, while still hot, on low speed for 2m to avoid crystallization

Transfer to a bottle. The simple syrup is ready

Cut <quantity>½</quantity> lemon into wedges. Cut the wedges in half

Cut <quantity>½</quantity> lime into wedges. Cut the wedges in half

Add the cut lemon and lime to a cocktail shaker

Add <quantity>20<unit>ml</unit></quantity> of the simple syrup

Add <quantity>3<unit>dashes</unit></quantity> of angostura bitters and smash

Add <quantity>60<unit>ml</unit></quantity> of cachaça

Fill the cocktail shaker with ice cubes and shake vigorously until thoroughly chilled

Strain the cocktail into a highball glass filled with ice cubes

Add <quantity>20<unit>ml</unit></quantity> of fino sherry wine

Garnish with mint sprigs to taste

The cachaça xmash is ready! Enjoy!