What to do with leftover ingredients

I had leftover flank steak, portabella mushrooms, and potatoes in my fridge that I needed to get rid of. I decided to marinate the flank steak with garlic, S&P, make a mushroom cream sauce, and mashed potatoes. Unfortunately, my propane tank was out so I had to broil the flank steak at the last minute. All went well though - the mashed potatoes and the mushroom sauce turned out great. I simply used olive oil, butter, vermouth, mushrooms, onions, milk, and a bit of cornstarch to thicken it up. Yummy.

Sorry about the presentation - had some help from my lovely boyfriend. ;)