You will need:
Pork Loins (as many as you want to cook)
Lemons - 1/2 a lemon per loin and have an extra for juice
Onion - 2 rings per loin
Preheat oven to 425.
Place pork loins in baking dish. Cut lemons and onions into rings. Place lemon slices directly on top of loins. Squeeze extra lemon over entire dish to add some juice. Then stack onion rings on top of lemons. Sprinkle brown sugar over whole dish. And top with ketchup. I just make pretty lines about 1/2 inch apart over complete dish. Cover with foil. Place in oven for 45 minutes. Or until throughly cooked.
You can adjust the ingredients to taste after making this dish for the first time. If you want more lemon taste, add more lemons. You can do the same with onions. Add more or less. The taste of the dish will change with the adjustments. More brown sugar will give it a more intense taste. Feel free to try with chicken too.