Beef Tenderloin With Sauteed Mushrooms with butter

4 tablespoons butter 2 tablespoons olive oil 14 ounces white button mushrooms , sliced (can use more) 2 -3 tablespoons shallots , finely chopped (or to taste)[...]

2 cups dry red wine 1 cup tawny port 2 cups beef broth 3 tablespoons butter 2 onions , chopped 1 tablespoon fresh thyme , chopped (or use 1 teaspoon dryed) 3[...]

2 tablespoons olive oil , divided 5 cloves garlic , peeled and minced 1 onion , finely chopped 10 ounces fresh mushrooms , sliced 1 lb baby spinach, washed[...]