Divide the pork tenderloin in 4 equal parts and season with salt and pepper. Roast in a skillet with a shadow of olive oil until cooked all the way thru, turning it on all sided to give it a nice golden color.
Meanwhile caramelize the onion, pear and apples. Melt the butter in a sauté pan. Cook the onion, pears and apples on low heat until they are brown, stirring often and being careful not to burn them. Taste the onions and they should be slightly sweet. Add the sugar and stir until the sugar dissolves.
To serve, spoon the warm onion mixture over the pork.
Giangi's Kitchen provides nutritional information, but these figures should be considered estimates, as a registered dietician does not calculate them.