for the infused gin
12 butterfly pea flowers, whole
375 mL London Dry Gin
for the lavender syrup
½ cup sugar
½ cup water
1 pinch salt
1 tbsp lavender flower buds, whole
for the cocktail
2 oz butterfly pea flower-infused London Dry Gin
½ oz lemon juice
¾ oz grapefruit juice
½ oz lavender syrup (adjust to taste)
optional
3 dashes tonic bitters