Pork Tenderloin Smothered in Onion and Mustard without chicken

2 tablespoons butter 2 tablespoons oil 4 mushrooms , finely diced 3/4 cup onions or 3/4 cup shallot , finely diced 1 carrot , finely chopped 2 cups coarse[...]

1 lb pork tenderloin 1 teaspoon salt 1/2 teaspoon black pepper 1 cup red onion , thinly sliced 1 apple , cut into thin wedges 1 garlic clove , finely minced 2[...]