Mignon Sandwich with Caramelized Onions

A Gourmet Indulgence

Introduction

A Mignon Sandwich with Caramelized Onions is a luxurious take on a classic sandwich, combining tender filet mignon, sweet caramelized onions, and creamy melted cheeses in a crispy baguette. This recipe is perfect for an elevated lunch or a cozy dinner, delivering a balance of smoky, savory, and slightly sweet flavors in every bite.

Ingredients

• For the Steak:
  • 8 oz (225g) filet mignon
  • 1 tbsp Dijon mustard
  • 1/2 tsp smoked paprika
  • Salt to taste
  • 1 tbsp olive oil
• For the Caramelized Onions:
  • 1 tbsp olive oil
  • 2 tbsp butter
  • 3 onions, thinly sliced
  • 1 tbsp water (if needed)
• For the Sandwich Assembly:
  • 1 baguette
  • 1/2 cup (50g) shredded mozzarella cheese
  • 2 oz (60g) Brie cheese, sliced
  • 3 tbsp mayonnaise
  • 1 tbsp Dijon mustard
  • Fresh parsley for garnish

Instructions

1. Prepare the Steak:
   • Rub the filet mignon with Dijon mustard, smoked paprika, and salt.
   • Heat a skillet over high heat, add olive oil, and sear the steak on all sides for about 2 minutes per side.
   • Transfer to a preheated oven at 320°F (160°C) and cook for 15 minutes. Let it rest before slicing thinly.
2. Caramelize the Onions:
   • In a pan, melt butter with olive oil over medium-low heat.
   • Add the thinly sliced onions and cook, stirring frequently, for 25-30 minutes. If the onions stick to the pan, add a splash of water to deglaze.
   • Once golden brown and soft, remove from heat.
3. Toast the Baguette:
   • Cut the baguette in half and sprinkle both sides with mozzarella cheese.
   • Toast in an air fryer or oven until the cheese melts and the bread turns crispy.
4. Assemble the Sandwich:
   • In a small bowl, mix mayonnaise with Dijon mustard to make a creamy spread.
   • Spread the mustard-mayo on the toasted baguette, then layer with thinly sliced filet mignon, caramelized onions, and slices of Brie cheese.
   • Garnish with fresh parsley and serve immediately.

Tips for Success

• Use High-Quality Steak: Filet mignon provides the most tender texture.
• Slow-Caramelize the Onions: Patience is key to achieving deep, sweet flavor.
• Customize the Cheese: Try swapping Brie for Gouda or Camembert for a different taste.

Why This Recipe Works

This sandwich balances richness and texture, combining juicy filet mignon, gooey cheese, and crispy bread. The caramelized onions add a subtle sweetness that enhances the overall depth of flavor, making this a truly indulgent bite.