Beef Stroganoff with Straw Potatoes

by Nadia Kim

4 servings

Mustard Sour Cream Sauce

• ≈ 28 gunsalted butter
• ≈ 16 gall-purpose flour
• ≈ 2 gdry mustard powder
• ≈ 240 gbeef stock
• ≈ 57 gsour cream

Beef

• ≈ 28 gunsalted butter
• ≈ 70 gsmall yellow onion
• 680 gbeef tenderloin
• kosher salt
• black pepper

Straw Potatoes

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