Beef Tenderloin without seasoning custard

2 tablespoons unsalted butter 1 tablespoon olive oil 1 1/2 cups diced potatoes , rinsed (1/2 inch) 1 cup baby carrots 1 cup small white button mushrooms 1/3[...]

2 (8 ounce) red potatoes 1 tablespoon olive oil 2 (4 ounce) beef tenderloin steaks , 3/4 inch thick (filet mignon) salt black pepper 2 tablespoons shallots ,[...]

2 teaspoons butter 1 cup vertical sliced sweet onion 1 cup vertical sliced red onion 1/4 cup sliced shallot 3 garlic cloves , minced 1/2 cup beef broth 2 cups[...]