Apple and Raisin Stuffing

For the Stuffing

• 1 large onion, chopped

• 4 tablespoons oil

• 1/2 pound mushrooms, sliced

• 3 tart apples, cubed

• 2 slices challah, soaked and squeezed

• 2/3 cup raisins

• 1 teaspoon salt

• 1/4 teaspoon pepper