Cocktail Rocka Billy

Ingredients: 

4 rocket leaves

3 cl gin

2 thin lemon slices

1 dash of aromatic bitters

Salt

1 grapefruit peel

Add in a mixing glass the rocket leaves, the lemon slices and some salt and muddle them well. Then, add Grapefruit Castro liqueur, gin and a dash of aromatic bitters. Shake well, double-strain and pour into a chilled coupé or martini glass. Garnish with a grapefruit peel and some rocket leaves.