Season both sides of pork chops with salt and pepper.
Heat a heavy saute pan and add 1 tablespoon of butter and the oil. Over medium heat, saute the chops for 5 minutes on each side, or until slightly pink on the inside.
Remove chops to a heated platter and pour off the excess fat. Deglaze the pan with 3 tablespoons of the vinegar and the sherry. Add the veal stock and, over moderate heat, reduce until slightly thickened. Reserve.
Saute the bacon until crisp. Spoon off all but 2 tablespoons of the bacon fat and deglaze the pan with the remaining 4 tablespoons of sherry wine vinegar. Add the cabbage and stir, over high heat, until heated through. Season, to taste, with salt and pepper.
Heat the sauce and whisk in the Dijon mustard and remaining 1 tablespoon butter.
Divide the cabbage on heated plates. Place a pork chop on each bed of cabbage and nappe each chop with the sauce. Garnish with chopped tomatoes and sprinkle with chives.
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