Beef Wellington

1 (3 lb) beef tenderloin salt & freshly ground black pepper 1 lb button mushroom 3 large shallots , finely chopped 1 (17 1/3 ounce) package frozen puff pastry[...]

1/3 cup olive oil 1/2 cup sliced onion 1/2 cup carrot 1/2 cup celery 1/4 teaspoon dried thyme 1/4 teaspoon sage 1 bay leaf 3 allspice berries or 3 cloves 6[...]