Add lime juice, demerara syrup, mango puree, rum, saline solution and a scoop of ice into a mixing glass.
Cap, then shake vigorously 20X, until chilled.
Remove cap.
Strain into a chilled coupe glass.
Garnish by wrapping an orange peel around itself to make a small circle and holding it together by pushing a bamboo pick through the end of the orange peel and into the other side of the circle, ensuring you have the flat side of the pick facing down. Put a fresh mint sprig inside of the circle you created with the orange peel. Set across the top of the glass as shown in the photo.
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