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grilled portobello steaks with chimichurri & onion strings_hot for food

grilled portobello steaks with chimichurri & onion strings

Proving yet again, you don’t need meat to feel satisfied! These juicy and charred portobello steaks will satisfy that craving you have to bite into something flavorful and meaty. 

Course Main Course
Cuisine American
Keyword chimichurri, crispy onions, portobello mushroom, steaks
Prep Time 30 minutes
Cook Time 20 minutes
Total Time 50 minutes
Servings 4
Author Lauren Toyota


chimichurri (makes 1 cup)

  • 2 tbsp finely chopped shallots
  • 1/2 C finely chopped packed flat leaf parsley
  • 4 garlic cloves, minced
  • 1 tbsp finely chopped fresh oregano (or 2 tsp dried oregano)
  • 2 tbsp red wine vinegar
  • 2 tbsp lemon juice
  • 1/3 C olive oil
  • 1 to 2 tsp spicy red chili such as bird’s eye chili, finely minced or red chili flakes (to taste)
  • sea salt and ground black pepper, to taste

grilled portobello steaks

mushroom “steak” spice

  • 2 tbsp mustard seed, slightly crushed in mortar & pestle
  • 2 tbsp granulated garlic
  • 2 tbsp dill weed
  • 2 tbsp brown sugar
  • 2 tsp kosher salt
  • 2 tsp dried minced onion flakes
  • 2 tsp dried minced garlic flakes
  • 2 tsp whole black peppercorns, crushed in mortar & pestle (or ground black pepper)


  1. Make the chimichurri by combining all the ingredients in a bowl. Refrigerate while you prepare the portobello steaks and onion strings. Don’t make this too far in advance as it will brown.
  2. Trim the stems from the mushroom caps.
  3. In a small bowl combine vegetable oil, low-sodium soy sauce, and liquid smoke.

  4. Combine all of the mushroom steak spices in a separate bowl big enough to fit the mushroom caps.
  5. Brush the oil mixture over each portobello mushroom on each side. Then coat both sides in the steak spice covering it thoroughly. Repeat with remaining mushrooms. Place them on a baking sheet or platter.
  6. Heat a cast iron grill pan over medium-high heat. When hot, place 2 to 3 mushrooms top down and grill for 2 minutes. Turn the mushrooms slightly about 45 degrees to get cross hatched grill marks. Grill for another 2 minutes. Flip and grill the underside of the mushroom for 2 minutes. Turn the mushrooms slightly and cook for another 2 minutes. Set aside to let the mushrooms rest.

  7. If you have another cast iron, you can place it on top of the mushrooms while grilling to help press the moisture out. See the video tutorial above for further instructions.

Recipe Notes

Get the crispy onion string recipe here and a homemade baked french fries recipe here!