For a filet 3 LBS
1/2 cup of brown sugar
60g of coarse salt
4 cups of water
1,5 cup of maple syrup
I hot smoked as Kummok said starting at 100f and increasing 10-20 degrees every 2h up to 170f (smoker temp).
Smoke with Alder for 4h of smoke
While smoking, baste with maple syrup every 30 minutes and take out at 140f