Bistro Burger with Blue Cheese, Caramelized Onions and Cornichon Aioli

Bistro Burger with Blue Cheese, Caramelized Onions and Cornichon Aioli

www.williams-sonoma.com

This bistro-style burger layers blue cheese, deeply caramelized onions, and tangy cornichon aioli over a juicy beef patty for a rich, French-inspired take on th

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Ingredients

  • 5 Tbs. (2 1/2 oz./75 g) salted butter, divided
  • 2 Tbs. olive oil
  • 1 yellow onion, thinly sliced
  • 1/4 cup (2 fl. oz./60 ml) water
  • Kosher salt
  • 6 garlic cloves, thinly sliced
  • 1 Tbs. fresh thyme leaves, minced
  • 2 Tbs. balsamic vinegar
  • 1 garlic clove
  • 1 cup (5 1/4 oz./150 g) cornichons, drained
  • 1 whole egg plus 2 egg yolks
  • 1 cup (8 fl. oz./250 ml) neutral oil or mild olive oil
  • 1 lb. (500 g) ground beef, at room temperature
  • freshly ground pepper
  • Neutral oil as needed
  • 1/2 cup (2 1/2 oz./75 g) crumbled or thinly sliced French blue cheese
  • <br> 2 Tbs. salted butter
  • 4 brioche buns, split
  • Handful of arugula for serving

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