Lettuce-Wrapped Burgers with Caramelized Onions + Mushrooms

Lettuce-Wrapped Burgers with Caramelized Onions + Mushrooms

blog.barre3.com

What’s better than a good burger in the summertime? The grass-fed beef in this super-tasty, high-protein recipe delivers a healthy dose of iron, B12, zinc, and

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Ingredients

  • 1 tablespoon olive oil
  • ½ teaspoon kosher salt, divided
  • 1 large yellow onion, very thinly sliced
  • 1 pound crimini mushrooms, stems removed, and thinly sliced
  • 1 tablespoon reduced-sodium gluten-free tamari
  • 1 teaspoon fresh, chopped rosemary
  • 1 pound 10% grass-fed ground beef
  • 8 Bibb lettuce or romaine leaves
  • 2 sliced Roma tomatoes (for serving)
  • 1/2 red onion, thinly sliced (for serving)

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