Vegetarian Mapo Tofu

Name: Vegetarian Mapo Tofu
Ingredients: For the tofu; 1/2 ounce dried porcini mushrooms; 1 1/2 cups boiling water; 5 tablespoons canola oil, divided; 6 ounces button mushrooms, quartered; 1/3 cup vegetable broth; 2 tablespoons soy sauce; 3 cloves garlic, minced; one 2-inch long piece of ginger, peeled and minced; 1 tablespoon corn starch dissolved in 2 tablespoons warm water; 1 package firm silken tofu, cubed; 2 tablespoons spicy bean paste (mine came in a mini toothpaste-esque tube—it looks like a thicker, lighter Sriracha); 1 tablespoon sesame oil; For serving; Brown rice; Chopped fresh chives