filet mignon with tarragon with margarine

itemscope itemtype="http://data-vocabulary.org/RecipeIngredient"> 1 tablespoon butter or stick margarine, divided 1/3 cup finely chopped shallots 1/2 pound[...]

1 tablespoon butter or 1 tablespoon margarine , divided 1/3 cup finely chopped shallot 1/2 cup fresh shiitake mushroom, stems removed 1 1/2 cups cabernet[...]

4 beef tenderloin steaks , cut 1 inch thick 1 teaspoon olive oil 1/4 teaspoon pepper 2 large portabella mushrooms , halved and sliced 8 green onions , cut[...]

4 filet mignon salt and pepper 1 tablespoon butter or 1 tablespoon margarine 1/4 cup brandy 2 tablespoons onions , finely chopped 1 cup heavy cream 1/4 cup[...]

4 filet mignon (you can use any other steak instead) 1 tablespoon vegetable oil 1 tablespoon butter (NOT margarin) 1 tablespoon demi-glace 1/4 cup white wine[...]