(Note: Normally I add about 3% fragrance or essential oil to the soap base, but peppermint is an especially strong essential oil, so I reduce it to about 2% - for this recipe, about .6 ounce. Use your own judgement and scent to your liking.)
Spray the arranged slivers of soap with alcohol and gently pour the melted, scented soap into the mold cavities. Give the mold a few taps to free any trapped air bubbles, or poke the slivers with a chopstick or spoon. This will also help to free any trapped air bubbles.
Set the mold aside, or pop it into the fridge to cool.
