Measure out one cup (250ml) of kawakawa infused oil, saving the remaining few tablespoons just in case you need to tweak the consistency of the balm later. Add beeswax pastilles.
Stand in a small saucepan simmering with water. A double boiler is another option here. Heat until the beeswax has totally dissolved. You might like to test the consistency of the salve here (see notes).
Once happy with the consistency, allow to cool slightly, then add essential oil right before pouring. Use a sterilised glass wand/stick if you have one to stir in the essential oil fully.
Work quickly, pouring into sterilised glass jars.
Allow to cool, then label and date each jar. To use, massage a little into skin as needed.