Abalone and Shiitake Mushrooms in Brown Gravy with Bok Choy

Name: Abalone and Shiitake Mushrooms in Brown Gravy with Bok Choy
Ingredients: 3 ounces extra-thick dried shiitake mushrooms (about 15 large pieces); Kosher salt; 8 large or 12 medium frozen abalone, defrosted and cleaned (about 2 pounds; see Cook’s Note); 1/4 cup vegetable oil; 4 cloves garlic, finely minced; 3 coins ginger, each about 1/4 inch thick; 2 tablespoons Shaoxing wine; 5 tablespoons oyster sauce; 2 tablespoons chicken bouillon powder; 2 tablespoons light soy sauce; 2 teaspoons sugar; 1/2 teaspoon dark soy sauce; 3 medium Shanghai bok choy (about 12 ounces), halved lengthwise; 2 tablespoons cornstarch; 1/4 teaspoon toasted sesame oil