FOR THE STEAK AND POTATOES
In a large skillet heat 2 tablespoons olive oil.
Add onions and season with salt and pepper; cook over medium-high heat, stirring frequently, for 1 to 2 minutes, or until they begin to soften.
Add garlic and cook for 30 seconds.
Stir in mushrooms and continue to cook for 3 minutes, or until veggies are tender.
Remove onion mixture from skillet.
Return skillet to heat and add remaining olive oil.
Add steak strips and cook until browned on all sides; about 2 minutes.
Remove steak strips from skillet.
Add water to the skillet and stir in potatoes and carrots.
Season with salt and pepper.
Bring to a boil.
Reduce to a simmer, cover skillet with a lid and let cook for 12 to 15 minutes, or until vegetables are tender.
In the meantime prepare the sauce.
Combine all ingredients in a small mixing bowl and whisk until thoroughly combined.
Remove lid from skillet.
Add in steak and onion mixture.
Stir in the prepared sauce and continue to cook for 4 minutes, or until heated through.
Remove from heat.
Garnish with fresh parsley and serve.