The Smashroom (Portobello Smash Burger)

Where flavour meets function — smoky, umami, and deeply nourishing.

Mushrooms aren’t just meaty and satisfying — they’re one of the few plant-based sources of vitamin D.
When paired with aged white cheddar, you create a nutrient trifecta that supports whole-body health:

• Vitamin D for mood, immunity, and hormone balance 

• Calcium to strengthen bones and muscles 

• Vitamin K₂ (naturally found in aged cheeses) to help calcium go where it belongs — in bones, not arteries.

It’s the kind of synergy Culinary Medicine celebrates — food that tastes incredible and works in harmony with your biology.

Ingredients

• 1 lb portobello mushrooms (4 large caps), cleaned and stems trimmed

• 2 tbsp neutral oil 

• 2 cloves garlic, minced

• 1 tbsp white miso paste

• 1 tsp smoked paprika

• 1 tbsp chili crisp (optional, for spice)

• ½ tsp freshly ground black pepper

• 1 tbsp balsamic vinegar

• ¼ cup grated aged white cheddar cheese (or vegan cheese substitute)

Method

1. Make the Marinade

In a small bowl, combine oil, garlic, miso, smoked paprika, chili crisp (if using), and pepper to form a paste.

2. Prep the Mushrooms
Score a shallow “X” across the top of each cap.
Brush the paste over both sides to evenly coat.
Marinate for at least 2 hours — 8 hours or overnight develops deeper umami flavour.

 3. Roast

1. • Oven: Preheat to 425°F (220°C). Place mushrooms stem side down on a parchment-lined baking tray. Roast for 20 minutes, until very soft and juicy.

   • Air Fryer: Preheat to 400°F (200°C) and roast for 10 minutes, until tender.

     
     

     Smash & Broil

     Remove from heat, flip the mushrooms, and gently smash them flat using the bottom of a clean glass, pan or rolling pin.
     Preheat oven or air fryer to high broil.
     With mushrooms stem side up, drizzle with balsamic vinegar and sprinkle with aged white cheddar.
     Broil for 2–3 minutes, until the edges crisp and the cheese melts golden.

      

      

     Serve
     Serve immediately on a toasted bun or crisp lettuce wrap with your favorite toppings — caramelized onions, avocado, or roasted red pepper aioli.

FoodU Tip

Eat it your way — solo, stacked, or as the star of your next burger night on a bun or in a lettuce wrap. 

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