Put a frying pan on medium-low heat.
Add the oil.
Add the cashews. Mix to coat with oil.
Remove rosemary from the stem and chop the leaves. Add the rosemary to the pan.
Mix continuously for 5 minutes until the cashews are golden.
Turn off the heat and add the maple syrup. Mix to coat all the nuts.
Take off heat and let cool completely.
Sprinkle with salt.