In a food processor, mince the pecans, brown sugar and 1/4 teaspoon of salt until finely ground, about 30 seconds. Dump into a wide and shallow dish.Whisk the eggs, then whisk in the milk, cinnamon, zest, vanilla and remaining salt. Pour into a second wide and shallow dish. Heat a skillet over medium low for a few minutes. Dunk the bread, one slice at a time, quickly into the custard. Flip and dunk the other side. Place the bread into the nut mixture and lightly dredge on both sides. Shake off any excess. Place a knob of butter into the skillet and melt it completely. Place the coated bread into the skillet and brown for 4-6 minutes on each side. Though if you sense it is browning quickly, go ahead and remove it early. It will finish cooking in the oven anyway. Cook the toasts in batches of two. Place the browned toasts on a sheet pan.Once all toasts are browned, finish baking them in a 350 degree preheated oven for 15 minutes.