Grass-fed Beef Burger with Apple Celery Slaw

Grass-fed beef burger with apple-celery slaw is easily one the best burgers you’ll eat this year.

Tender from the mushrooms and onions, flavorful from the grass-fed beef, and great crunch from the slaw, you can’t miss with this burger recipe. 

And, it’s easy, takes about 20 minutes active cooking time. You can cook it in a cast-iron skillet on the stovetop or on the grill. Of course, if you love to grill then go for it. And, when cooking avoid pressing down on the burgers. The only thing that does is spew all those flavorful juices you want to keep. 

Grass-fed Beef Burger with Apple Celery Slaw

Prep Time 25 minutes
Cook Time 20 minutes
Total Time 55 minutes
Servings 4
Author Tania Van Pelt


For the Burger

  • 1 medium onion chopped
  • 10 ounces portobello or cremini mushrooms trimmed and quartered
  • 2 tablespoons plus 2 teaspoons olive oil divided
  • Salt and pepper
  • ½ teaspoon ground cumin
  • 1 pound 100% ground buffalo or grass-fed beef
  • 4 big green leaf lettuce leaves to use as buns or 4 hamburger buns, split and toasted

For slaw

  • 2 celery ribs diced
  • ½ Granny Smith apple cored (left unpeeled), julienned
  • 1 tablespoon cider vinegar
  • 1 tablespoon olive oil
  • 1 teaspoon organic mayonnaise
  • 1 teaspoon whole-grain mustard
  • Salt pepper to taste


For the Burgers

  1. Pulse onion and mushrooms in a food processor until finely chopped. If not using a food processor, finely dice the onions and mushrooms. Heat 2 tablespoons oil in a 10-inch heavy skillet over medium heat until it shimmers. Add mushroom mixture, ground cumin, 1 teaspoon salt, and 1 teaspoon ground black pepper and cook, stirring occasionally, until vegetables begin to brown and liquid has evaporated, 8 to 10 minutes. Transfer to a bowl and cool to warm, about 15 minutes.
  2. Mix grass-fed beef or buffalo into cooled mushroom mixture with your hands until well combined. Form into 4-5 (4-inch) patties.
  3. Heat remaining 2 teaspoons oil in a 12-inch heavy skillet over medium-high heat until it shimmers. If grilling, brush the grill with vegetable oil, heat grill to medium-high heat.
  4. Cook burgers, turning once, about 8 minutes total for medium-rare.
  5. Serve on lettuce leaves or buns, top with slaw.

For the Slaw

  1. While the mushroom and onion mixture is cooling, finely dice celery and cut apple into 2-inch-long thin julienne
  2. Whisk together mayonnaise, vinegar, oil, mustard. Add celery and apple, tossing to coat. Let stand 15 minutes to develop flavors. Season to taste with salt and pepper.