Sigeumchi Namul (Korean Marinated Spinach Banchan)

Name: Sigeumchi Namul (Korean Marinated Spinach Banchan)
Prep time: 5 min
Cook time: 15 min
Total time: 20 min
Cuisine: Korean
Ingredients: 1 pound (2 bunches; 450g) mature spinach, bottom 1/2 inch of stems trimmed, leaves washed well and drained (see note); Kosher salt; 2 tablespoons (30ml) unseasoned rice wine vinegar; 1 tablespoon (15g; 15ml) doenjang (Korean fermented soybean paste); 1 tablespoon (15ml) honey; 1 teaspoon (5ml) fish sauce; 1 teaspoon (2g) freshly ground black pepper; 1 medium garlic clove (5g), finely grated; 2 tablespoons (30ml) toasted sesame oil; 2 tablespoons (20g) toasted sesame seeds; 2 scallions (40g), sliced 1/4 inch thick on a bias