Momofuku Pork Buns at Home

Name: Momofuku Pork Buns at Home
Cuisine: Asian, Chinese
Ingredients: 3 lbs pork belly; 1/4 cup coarse salt; 1/4 cup sugar; 1 large onion, sliced; 2 tablespoons grated ginger; 3 scallions, thinly sliced; 10 Buns (Chang, in his book, encourages to buy frozen ones from a Chinese grocery store.); Pickled Cucumbers; 2 Kirby cucumbers, cut into 1/8-inch thick slices; 1 tablespoon sugar; 1 teaspoon salt; 2 tablespoon rice vinegar; Sauce; 1 cup hoisin sauce; 2 tablespoons rice wine; 1/2 teaspoon minced garlic; 1/2 teaspoon minced ginger; 1 tablespoon honey or sugar