Dissolve the salt and sugar in 2 cups of water. If pork chops are very thick, cut horizontally into 2 cutlets. Pound chops with a tenderizer until about 1/4 inch thick. Place into brine and allow to rest 30 min or longer in the fridge.
If you are going to sous vide these, after they brine, put them in the sous vide bags and vacuum seal. You can add some garlic or shallot in too if you want extra flavor. Sous vide at 150 degrees for 2-4 hours.
Remove the pork from the brine, or from the sous vide bags and dry. Heat a skillet to smoking hot. Add a tbsp of oil and the pork chops. If they are already sous vide, cook for 1 minute on eat side over high to get a golden crust on them. If they are still raw, cook for 2 minutes on one side, flip and cook 2 minutes. Check with an instant read thermometer to make sure they are at least 150 degrees.
Reduce heat on the pan to medium. Melt 1/2 tbsp of butter in the pan. Add the shallot and cook for 1 minute, stirring so it doesn't burn. Add the flour and mustard, whisking constantly. Slowly add the broth and cider, whisking the whole time. Bring to a boil and then reduce heat and simmer 5 minutes. Add the sage and the whole grain mustard and 1/2 tbsp butter. Stir and taste and adjust seasoning. Serve sauce over the pork chops and potatoes or whatever you are serving them with.