Tenderloin of pork is one of my all time favs to cook
An FYI- Pigs used to be dirty animals, they were fed garbage which made the meat very fatty yet extremely flavorful, but if the pork was under cooked you could get worms. Over the past few decades pigs are a lot leaner since they are grain fed now, which means 2 things, they have less fat which equals less flavor and the worm parasite is completely non existent, the FDA a few yrs back actually lowered the suggested cooking temp for pork from 165 to 145.
If you are cooking a .... or shoulder cook the pork low and slow to about 165, but for a pork tenderloin, find a piece with the most fat and cook it to about 130 degrees, when the meat rests it will go up at least another 5 or 10 degrees.
Fruit and pork pair well together, apples, pears, and peaches particularly.
I have 2 suggestions for fruit; the first would be to take the hole fruit and put them cut side down into a hot pan, where you already started a caramel sauce of butter and brown sugar, cook the fruit for 3-5 minutes till you start to see them caramelize and brown, add a lil bit of Christmas spice* toss and dump in your roasting pan with the pork loin and then bake till the pork is 130 degrees
*(cinnamon, clove, ginger, nutmeg, allspice; etc. Use only one or 2 of the spices, keep it simple and understated, but all these spices pair nicely)
The second suggestion for fruit (and the one I like the most) is chutney.
This is how to make a basic one
Sautee some aromatics in olive oil (usually onion, but shallot or garlic or ginger or some combo works good)
The next step is a vinegar and sugar (I like apple cider vinegar and granulated sugar, but you can use what you want and replace the granulated with brown sugar or honey; *you can also add a bit of OJ or cider to in addition to the vinegar if you dont like the strong vinegar sauces)
Add diced or sliced fruit
Cook on high, add one or two of the Christmas spice that I mentioned before (ground mustard or curry powder could also be used in addition to the others)
Cook on medium high for 5 minutes till thick
*(for a thicker sauce combine 1tb of corn starch to 1tb of cold water, mix and add to sauce)
For a spiced fruit and pork loin my favorite herb is Rosemary (although thyme is good too)
A simple wet rub of olive oil, kosher salt, fresh cracked pepper, and chopped fresh rosemary is the best.
Another rub that I use is as follows
Mince garlic cloves and drizzle with olive oil and kosher salt
(using the blade and flat side of the knife drag the garlic over the cutting board to form a paste in a similar manner as a mason would spread grout on a floor he was about to tile; *you can also use a mortar and pestle if you have one)
In a bowl, add garlic paste, rosemary, salt, pepper, and white wine vinegar to form the wet rub for the pork
*Note- on the pork tenderloin make sure that you score a diamond pattern in the fat before you add the wet rub.