Slow-Roasted Balsamic Portobello Mushrooms over Cast Iron and Live Fire

Thanks to Kingsford for sponsoring this post. All opinions are my own.

I couldn’t be more excited to cook outside this weekend at our home in the great north of pure Michigan. What better time of year to light a chimney of smoldering Kingsford Charcoal, enjoy the warmth beside a billowing fire and prepare a family-favorite recipe.

These slow-roasted portobello mushrooms are not only a breeze to prepare, but the recipe only calls for a short list of ingredients that you most likely already have on hand, and the dish is ready in less than 30 minutes! Above all, these mushrooms are beautiful in presentation and loaded with an abundance of umami flavors, from the earthiness of the fungi itself, to the sweetness of the aged balsamic, saltiness of the soy, to the nutty flavors of browned butter, fragrance of fresh rosemary and touch of heat from the cayenne pepper. Just and incredible dish sure to be loved as a standalone, garnished atop a hunk of perfectly grilled prime-grade beef, plated to compliment a filet of hardwood-smoked salmon, or tossed into a rustic wholegrain and herb salad, as shared in this post.

To get started, simply rinse the mushrooms in cold water and wipe clean with a damp paper towel. Be certain to not soak the mushrooms in water as they have a naturally high water content. This method will not only help the mushrooms incrementally absorb the marinade, but will also better brown in the cast iron pan. Marinade and browning = Flavor!! At this juncture, you are welcome to leave the mushrooms whole, slice in half or quarters – your preference.

Once the mushrooms are prepared, to make the marinade, whisk together the oil, butter, balsamic vinegar, soy sauce, fresh rosemary, garlic and cayenne pepper, then season to taste with salt and pepper. Easy enough, right? And, if you love the essence of fresh rosemary like I do, don’t hesitate to toss in an extra sprig or two of rosemary! In an air-tight, re-sealable plastic container pour in the marinade and mushrooms, stirring to combine. Press out all extra air and refrigerate for two hours, up to overnight.

Thirty-minutes prior to the cook, work your way outside to light the grill. Load your chimney starter full to the brim with Kingsford Original Charcoal Briquets. Under the chimney stuff a couple pieces of crumpled newspaper. Ignite the paper and allow the coals to do their work. When coals are glowing and just ashed over, dump into a pile onto one side of the grill, then rake a few coals from your original pile to the opposite side of the grill floor, creating one high-stacked hot zone for searing (or sautéing) and one cooler zone for roasting. Also, be sure to keep a fresh bag of Kingsford Charcoal on hand – for every forty-five minutes of cooking, add a half-chimney of coals to keep the cook roaring.

To prepare the perfect pan of portobello mushrooms, pour all contents of the marinade container into a well-seasoned and oiled cast iron pan. Using protective gloves, carefully place the pan directly upon the high-pile of glowing charcoal embers – yes, right in the coals – cowboy-style! Once the liquid in the pan begins to simmer, stir the mushrooms consistently until the liquid is reduced by half. Then, move the pan over to the indirect cooking zone to slowly finish cooking. Stir intermittently while the mushrooms are imparted with all that delicious smokiness from the charcoal. When the mushrooms are tender and cooked through, and all pan liquids have evaporated, remove the pan from the heat and set aside to cool. For additional “umaminess,” pour in a half glass of white wine to the bottom of your pan at the end of the cook to deglaze the pan. Using a wooden spoon scrape up all those browned bits and reserve the drool-worthy sauce when it’s been reduced by half – preserve to pour atop your roasted mushroom just prior to plating. So. Darn. Good!

These mushrooms can be beautifully plated as a standalone dish or added into a warm quinoa and fresh herb salad – see photos below! But, just to give you a few extra ideas – these mushrooms can be stored for up to 4-6 days and easily repurposed into an array of other dishes! A few of my favorite include – grilled flanken-style short-ribs, portobellos and eggs over the campfire – just toss in a few of these mushrooms to take your steak and egg game to the next level. If considering amping up your next burger night, mince these mushrooms and press into your hamburger mix – the sweet, spicy and fragrant flavors will not only infuse phenomenal flavor, but cut calories in the process – how is that even possible??! Or, consider folding the mushrooms into a sweet-savory brie-bread pudding with celery and onion. Speaking of cheese… grilled cheese quite possibly may never be the same – just imagine all that melty, cheesy, mushroomy goodness in one buttery toasted sammy! Last, but not least, fold a few handfuls of these chopped portobellos into a creamy pasta dish with parmesan and prosciutto! The options are near endless. Now, get outdoors, light that charcoal and enjoy your cook!

Cheers my friends, David   

Slow-Roasted Balsamic Portobello Mushrooms over Cast Iron and Live Fire

Ingredients

  • 2 pounds mini portobello mushrooms, rinsed and cleaned
  • 2 tablespoons olive oil
  • 2 tablespoons browned butter, melted
  • 1/3 cup balsamic vinegar
  • 3 tablespoons soy sauce
  • 3 tablespoons fresh rosemary, finely chopped
  • 1 tablespoon minced garlic
  • 1/2 teaspoon cayenne pepper
  • Kosher salt and fresh ground pepper, to taste

Instructions

  • Whisk together oil, butter, vinegar, soy, rosemary, and garlic. Toss mushrooms in the liquid and marinate for two hours, up to overnight.
  • Thirty minutes prior to cooking, ignite the charcoal in a chimney starter. When coals are glowing and just ashed over, dump into a pile onto one side of the grill, then rake a few coals from your original pile to the opposite side of the grill floor, creating one high-stacked hot zone for searing (or sautéing) and one cooler zone for roasting. For every hour of cooking, add a half-chimney of coals.
  • Meanwhile, add mushrooms and marinade to a well-seasoned and oiled cast iron pan. Place pan directly into the smoldering charcoal embers, stirring intermittently until liquid reduced by ½. Move pan to indirect heat by repositioning the pan away from the coals or above the coals on an elevated grill grate. Remove from heat when the mushrooms are tender and all liquid absorbed.
  • Rest for 5 minutes and season additionally to taste. Plate atop a bed of quinoa and fresh herb salad.
  • Serve immediately.
Written by Live Fire Republic
David Olson is a nationally-recognized American Culinary Federation Chef, television personality and international social media influencer, award-winning recipe developer, live fire grill master, global adventurer-extraordinaire, and the creator behind, "Live Fire Republic." David has an organic and attentive audience of more than two million households weekly via countless television and event appearances, his blog, and various print, radio and social media channels. Meanwhile his recipes and creative content continue to be shared across the web and in print publications from sea to shining sea. For all media inquiries, please email PR agency, The Lisa Ekus Group; Boston, MA - Jaimee Constantine, 413.247.9325 or jaimee@lisaekus.com.