Remove the beard from each mussel. To remove, grab it with your thumb and forefinger and firmly pull it towards the shell’s hinge. You can use a paper towel or kitchen towel to improve your grip.
Check the beard and look for a white tip. The tip indicates that you removed the beard entirely.
Preheat your Z-Grills (preferably with branded applewood pellets) or other wood pellet grill to 350 degrees Fahrenheit.
On the stove top, melt the butter in a cast iron skillet over medium heat.
Add the chopped shallot/onion and saute for 3-4 minutes or until they are softened and fragrant. Toss in the garlic and saute for 30 seconds or so.
Pour in the wine, then add the salt and black pepper. Bring to a simmer.
Add the mussels to the skillet, cover with foil, poke a series of holes in the foil, and transfer the skillet to the grill grates.
Cover the grill’s lid and smoke the mussels for 10-12 minutes or until the mussels open up.
Remove the skillet from the grates, uncover it, and discard any mussels that did not open.
Transfer the mussels to a serving platter, spoon any broth in the skillet over the mussels, drizzle with lemon juice and finish with fresh herbs.
Serve.