Steak

Cup of Yum
1. Preheat your broiler on high and line a rimmed baking sheet with foil and lightly grease.
2. Lightly score 4 shallow cuts on both sides of the steak, two in each direction (per piece of meat if your sirloin is in smaller pieces).
3. Sprinkle both sides generously with freshly cracked pepper and salt.
4. Place steak on the prepared baking sheet and broil for 4 to 6 minutes per side, until steak reaches your desired level of doneness. Remove from oven, tent with foil, and allow to rest for at least 5 minutes before slicing across the grain.

Sauce

1. While your steak is cooking, heat a medium skillet over medium heat and lightly grease with cooking spray or a small drizzle of olive oil. Add mushrooms and sliced green onions. Saute until mushrooms are lightly browned, 3 to 4 minutes. Add garlic and cook for 30 seconds.
2. Transfer vegetables to a plate and return pan to heat.
3. Add beef broth to your pan and bring to a simmer. Simmer for 3 to 4 minutes until reduced by half. Remove from heat and whisk in sour cream and mustard. Add salt and pepper to taste (if you use full-sodium beef broth, you probably wont need salt). If not ready to serve, you can keep the mixture warm over very low heat--do not boil.
4. Serve steak alongside steamed green beans, with mustard sauce spooned over both. Enjoy!