Pork Tenderloin with feta

2 tablespoons olive oil 2 tablespoons unsalted butter 1 1/2 cups mushrooms , sliced 1 cup onion , chopped (1 medium) 5 cups fresh tomatoes , chopped (3[...]

1 1/2 lbs pork tenderloin 3/4 teaspoon lemon pepper 3/4 teaspoon salt 1 tablespoon oil 1 medium red onion , chopped 1 medium granny smith apple , peeled,[...]