Beef Stroganoff with Straw Potatoes

by Nadia Kim

2 servings

Mustard Sour Cream Sauce

• ≈ 14 gunsalted butter
• ≈ 8 gall-purpose flour
• ≈ 1 gdry mustard powder
• ≈ 120 gbeef stock
• ≈ 29 gsour cream

Beef

• ≈ 14 gunsalted butter
• ≈ 35 gsmall yellow onion
• 340 gbeef tenderloin
• kosher salt
• black pepper

Straw Potatoes

• ≈ 850 grusset potatoes
• kosher salt
• ≈ 7.5 gparsley