Mushroom Filling: 1. Heat 2 tablespoons sesame oil in a large skillet over medium-high heat. Add 2 chopped shallots and cook until fragrant, 2 minutes. Add 3 cups finely chopped mushrooms and 2 cloves chopped garlic. Cook, stirring occasionally until the mushrooms have cooked down, about 5 minutes. Add 2 cloves chopped garlic, 2 tablespoons soy sauce, and a large pinch of pepper. Stir in 2 cups chopped spinach. Cook another 2-3 minutes, until the mushrooms are caramelized. Remove from the heat and let cool.