Puree 3 to 4 cups of watermelon chunks in a blender or food processor.
Pour through a fine mesh sieve and press with a spoon to release all the juice.
Combine the sugar and 1 cup of watermelon juice in a saucepan over medium heat.
Bring to a simmer, whisking so the sugar dissolves.
Simmer for 1 to 2 minutes, then turn off the heat.
Stir in the remaining watermelon juice, lime juice, tequila and Grand Marnier.
Fill each popsicle mold with a lime slice.
Pour the watermelon mixture over top.
Freeze according to your popsicle maker’s directions, for at least 4 to 6 hours.
Serve with a sprinkle of sea salt.
Servings 0