Homemade Vegetarian Oyster Sauce (Vegan Stir Fry Sauce)

Name: Homemade Vegetarian Oyster Sauce (Vegan Stir Fry Sauce)
Prep time: 10 min
Cook time: 10 min
Total time: 20 min
Cuisine: Chinese
Ingredients: 1.4 oz (40 grams) dried shiitake mushrooms ((slightly less than 2 cups)); 2 tablespoons peanut oil ((or vegetable oil)); 2 cloves garlic (, finely minced); 1 teaspoon ginger (, finely grated); 1 tablespoon light soy sauce ((or soy sauce, or tamari for gluten-free)); 1 tablespoon dark soy sauce ((or soy sauce, or tamari for gluten-free) (*Footnote 1)); 2 teaspoons miso paste ((Optional) (*Footnote 2)); 1 teaspoon agave syrup ((or sugar)); 1/4 teaspoon five spice powder; 2 teaspoons sesame oil (, toasted)