Preheat your oven to 300°F (150°C).
Lightly grease a large baking dish with olive oil or butter.
Pat pork slices dry with paper towels.
Make the GlazeIn a medium bowl, whisk together:Dijon mustardHoney or sweetenerApple cider vinegarOlive oilGarlic powderSalt and pepper(Add cayenne if using)It should be smooth, thick, and slightly tangy-sweet.
Glaze & ArrangePlace pork slices in a single layer in your prepared baking dish.Spoon or brush the glaze generously over each piece, coating both sides.Cover the dish tightly with aluminum foil.
Slow BakeBake covered at 300°F for 3 hours.The pork will soften and become tender while absorbing the glaze flavor.
CaramelizeRemove foil carefully (watch for steam).Increase heat to 350°F (175°C).Return pork to oven uncovered for 30–40 minutes, basting once or twice.The glaze will reduce, bubble, and thicken into a glossy, sticky coating.
ServeLet pork rest for 5–10 minutes.Spoon pan glaze over top and serve with roasted veggies, salad, or cauliflower mash.