- 1/4 cup brandy
- 1 cup beef broth
- 2 cups packed baby spinach leaves (stems trimmed)
- Sour cream, for serving
- Chopped fresh parsley, for garnish
- Grated lemon zest, for garnish
In a large skillet, heat 2 tablespoons of the olive oil over medium heat. Add the onions and shallot and cook, stirring, until soft, 6 to 8 minutes. Add the garlic and thyme and cook, stirring, until fragrant, about 1 minute. Season with salt and pepper. Add the mush- rooms and cook, stirring, until the liquid released by the mushrooms has evaporated and the mushrooms brown, 8 to 10 minutes. Remove the thyme sprigs from the mixture and discard. Transfer the mixture to a large bowl. Set aside.
In the same skillet, heat the remaining 2 tablespoons olive oil over medium-high heat. Season the sirloin with salt and pepper and cook until browned, 1 to 2 minutes per side. Transfer to the bowl with the caramelized mushrooms. Remove the skillet from the heat.
Add the brandy, return the skillet to the heat, and use your spoon to scrape up all the bits on the bottom of the pan. Let the brandy simmer for 2 minutes. Add the broth and let it come to a simmer. Stir in the spinach and let them wilt before returning the mushrooms and meat to the pan. Cook just long enough to heat through. Adjust the seasoning with salt and pepper, if desired.
Assemble
Top the polenta with the stroganoff and serve with sour cream, parsley, and lemon zest.