Cooking : Broccoli Rabe with Portobello Mushroom

Ingredients
1/2 cup extra-virgin olive oil
3 cloves garlic, minced
1/2 cup red onion, chopped
3 sprigs fresh thyme, chopped
2 portobello mushroom caps, cut into 1/4-inch pieces
sea salt and freshly ground black pepper to taste
2 bunches broccoli rabe, ends trimmed, and cut into 2-inch pieces
1/4 cup grated Parmesan cheese, or as needed

Directions
Heat the olive oil in a large skillet over medium heat. Stir in the garlic and onion, and cook until the onion has softened, and the garlic begins to brown, about 10 minutes. Stir in the thyme and portobello mushrooms, then turn the heat to low. Season to taste with salt and pepper, and cook until the mushrooms have reduced but are not browning, 30 to 35 minutes.
Place a steamer insert into a saucepan, and fill with water to just below the bottom of the steamer. Cover, and bring the water to a boil over high heat. Add the broccoli rabe, recover, and steam until tender, about 6 minutes. Once the broccoli rabe has cooked, toss it with the mushroom mixture, and sprinkle with Parmesan cheese to serve.