Cut the soap base into small cubes. In a microwave safe bowl melt the soap base in 30 second intervals until fully melted.

Carefully remove the soap base from the microwave and let cool slightly. add in the lime essential oil and lime zest (if using).

Stir the soap mixture and pour into the silicone mold.

Allow the soap to harden (aprox 30 minutes) and remove from the mold.