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 selenium—plus fiber, thanks to the leafy-green lettuce wrap. These will be a hit at your next summer BBQ!
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)
|
