Whisk broth, wine, seaweed, miso, tamari (or soy sauce), maple syrup and Worcestershire in a small saucepan. Heat over medium heat, whisking occasionally, until the miso dissolves, 1 to 2 minutes. Add the mushrooms and reduce heat to maintain a bare simmer. Cook, stirring occasionally, for 30 minutes. Remove from heat and let cool, stirring occasionally, for 1 hour.