
8 cups cold water
2 cups mixed dried mushrooms, such as oyster, portobello and shiitake
4 fresh thyme sprigs, divided
½ cup salted butter, divided
1 pound mixed fresh mushrooms, such as baby bella, hen of the woods, oyster, shiitake, white button and wood ear, trimmed and halved
2 shallots, thinly sliced
4 cloves garlic, minced
½ teaspoon coarse kosher salt
½ teaspoon cracked black pepper
1½ cups Arborio rice
½ cup white wine vinegar
1 cup grated fresh Parmesan cheese
2 cups lightly packed baby kale, plus additional for garnish