To marinate the portobello

1. Destem and slice thinly at a 45-degree angle. Place the broth, vegan Worcestershire and dark miso into a shallow glass pyrex and toss the sliced mushrooms into it until well coated, taking care not to break them. Cover and place into the refrigerator to marinate for 1-2 hours.

To make the cauliflower mash

1. Place a steamer basket into a medium-sized pot and place a few inches of water into the bottom. Chop the florets off the tough stem. Rinse well, then place the florets into the steamer basket. Cover and steam over medium heat for 20-25 minutes, or until the cauliflower is soft and breaks easily when pierced with a fork.
2. While your cauliflower is steaming, place one tablespoon of olive oil into a small pan, add in the smashed garlic, and saute over low heat for a few minutes to soften, flipping as needed, and taking care not to let the garlic brown.
3. Once your cauliflower is done, transfer the florets to a food processor or blender. Allow to cool to room temperature before processing. Scrape in the softened garlic and oil, and add in the Earth Balance. Process until smooth and place into the refrigerator or set aside if serving immediately.

To saute the portobello

1. Remove from the refrigerator. Heat a teaspoon or two of olive oil in a large, flat-bottomed pan over medium heat. Remove the sliced portobello from the marinade (reserve the marinade), then place in the pan and allow to saute and deepen in color for a few minutes on each side. Transfer to a plate to cool.
2. In the same pan, add another drizzle of olive oil. Throw in the shallots and allow to soften and slightly crisp for a few minutes, breaking up the rings and stirring often to avoid burning. Transfer to another plate to cool.
3. Pour the reserved marinade into the same pan, and allow to sizzle and reduce for a few minutes. Stir occasionally as needed.
4. To serve the dish, fan out the portobello and drizzle with the reduced marinade. Top with the crispy shallots and microgreens, if desired. Reheat the cauliflower mash if chilled and serve immediately.