Roasted maple necks on bass and guitars these days are all the rage.
This one is from USACG. They are expensive to buy but beautiful.
Here's how you can do it yourself with any existing maple neck you may have on your bass or guitar at little to no cost.
Step one - Prep
Remove the neck from the instrument. Remove all the hardware and strings from the neck. Then thoroughly clean the neck with warm soapy water. Completely loosen the truss rod.
Now mix equal parts of olive oil and maple syrup (important !!! - do not use vegetable oil or other types of syrup, your instrument neck is made out of wood from maple trees, not cornstalks and blueberries).
Slather the mix all over the neck and allow it to soak in for about 15 minutes.
Step two - the roast
Bring your kitchen oven up to 400 degrees F and place the neck face down in the oven (this protects the ebony fretboard). Set the timer for 5 minutes for every inch of scale on the neck (i.e. a 30" scale neck will require 150 minutes of roasting time).
Step three - serving
Once the neck has completed roasting remove it from the oven and allow it to rest for 10 minutes. Then simply reinstall the neck and hardware, restring and tune to pitch. Now enjoy your delightfully roasted maple neck!