I marinated a loin in a little water, vinegar, oregano, garlic and pepper (similar to Italian dressing) then baked the loin until it was done, let it cool completely, then diced.
I did ^that^ earlier in the day, so this would be a great recipe for leftover pork loin as well.
I diced two large russet potatoes and one large yellow onion. Fried those up in a large skillet with a little butter.... when they we done I added the pork loin that I had diced until it was warm.
I served DH's with a scrambled egg on top, mine had a fried egg.