Pork Hocks Simmered with Bamboo Shoots

Name: Pork Hocks Simmered with Bamboo Shoots
Ingredients: 2 1⁄2 lb. fresh pork hocks; Kosher salt, to taste; 2 tbsp. canola oil; 1 small onion, halved and thinly sliced; 3 tbsp. fish sauce; 1 (3/4″) piece golden rock sugar; 6 canned bamboo shoot tips, cut lengthwise into sixths; 2 dried wood ear mushrooms, soaked in hot water, drained and cut into 1⁄2″-wide strips; 4 large dried shiitake mushrooms, soaked in hot water, drained, stemmed, and quartered; 1⁄2 lb. dried round bún rice noodles, boiled until tender, drained, and rinsed; 12 scallions, white and pale green parts only