Ingredients

For the onions:

• 3 tablespoons butter
• 4 medium onions, sliced
• Salt and pepper
• 2 tablespoons flour
• 1 bottle dark beer, such as Guinness
• 1 tablespoon Worcestershire sauce
• 1 cup beef stock

For the potatoes:

• 2 pounds potatoes
• Whole milk or half-and-half, for mashing
• 2 tablespoons Dijon mustard
• Salt and pepper
• Grated nutmeg
• 1 small bundle farm spinach, stemmed and chopped

For the steak:

• 4 flat-iron steaks or 2 pounds flank steak
• Salt and pepper
• Oil, for drizzling

Description

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