Preheat oven to 180˚C. Line a baking tray with non-stick baking paper.
Combine honey, macadamia oil, garlic, and sea salt in a small frying pan over low heat. Stir until honey has melted and the mixture is well-combined.
Transfer the honey mixture to a large bowl. Add macadamias and lemon myrtle and stir until they are evenly coated with the honey, lemon myrtle mixture.
Spread macadamias on the prepared baking tray. Bake for 10-12 minutes, turning occasionally. Remove and set aside to cool completely before serving. Store in an airtight container.