Beef Stroganoff with Straw Potatoes

by Nadia Kim

2 servings

Mustard Sour Cream Sauce

• 15 mlunsalted butter
• 15 mlall-purpose flour
• 2.5 mldry mustard powder
• 120 mlbeef stock
• 30 mlsour cream

Beef

• 15 mlunsalted butter
• ½small yellow onion
• 340 gbeef tenderloin
• kosher salt
• black pepper

Straw Potatoes

• 4russet potatoes
• kosher salt
• 30 mlparsley