Start by having everything ready to layer in your sandwich. Heat a skillet on medium heat, and add in the canola oil. Add the slices of smoked duck breast, moving them around the skillet, and sear for a couple of minutes on each side.
Take the bottom bun of your lightly toasted bun and layer on, or smear on the avocado. Season with a pinch of salt.
Next layer on the slightly crispy Nueske’s smoked duck breast, provolone cheese, tomatoes (season with a bit of salt and pepper), then the stack of lettuce. Place on the top bun, and feel free to smash it slightly into shape. You want mayo (I love it, my wife does not), feel free to slather it on the bun(s).