Add equal parts lime juice, gin, Maraschino liqueur (like Luxardo), and green Chartreuse into a cocktail shaker with ice or stir in a jar with ice.
Strain it into a tall jar and add 6 oz. of milk.
Stir gently to curdle and let sit for AT LEAST 30 minutes if in a hurry or just let sit overnight.
Strain through a fine mesh into a coffee filter, cheese cloth, or paper towel to collect milk curds and strain again.