Add the lemon or lime juice, sugar, and fresh mint leaves to the bottom of a sturdy glass or small jar. Using a muddler or the back of a spoon, gently press and twist the mint into the sugar and juice until the leaves are bruised and fragrant, and the sugar begins to dissolve.
Fill the glass halfway with ice cubes, creating a chilled base that will keep the drink refreshingly cool.
Pour the unsweetened coconut milk over the ice, allowing it to cascade through the cubes and mix lightly with the minty, citrusy base.
Top up the glass with sparkling water or plain soda, leaving a little room at the top so the drink doesn’t overflow. Give it a brief, gentle stir to combine the flavors without losing too much carbonation.
Garnish with a few extra mint leaves and a spoonful of pomegranate arils, letting the ruby-red seeds float on top for a festive, “White Christmas” look.
Serve immediately and enjoy your frosty Christmas Mojito / Coconut Mojito while it’s cold and bubbly.