Beef Stroganoff with Straw Potatoes

by Nadia Kim

2 servings

Mustard Sour Cream Sauce

• 1 tbspunsalted butter
• 1 tbspall-purpose flour
• ½ tspdry mustard powder
• ½ cupbeef stock
• ⅛ cupsour cream

Beef

• 1 tbspunsalted butter
• ½small yellow onion
• 0.75 lbbeef tenderloin
• kosher salt
• black pepper

Straw Potatoes

• 4russet potatoes
• kosher salt
• 2 tbspparsley