Scallion Fish with Sesame Kale

Name: Scallion Fish with Sesame Kale
Ingredients: 1 teaspoon vegetable oil; 1 tablespoon finely chopped peeled ginger, plus four ½”-thick slices; 1 tablespoon reduced-sodium soy sauce; 2 teaspoons fresh lemon juice; ½ teaspoon toasted sesame oil; pinch of sugar; 2 scallions, white and green parts separated, thinly sliced; 6 sprigs cilantro, leaves and stems separated; 2 5-oz. skin-on firm white fish fillets (such as branzino); Kosher salt; 1 tablespoon vegetable oil; 1 garlic clove, thinly sliced; 1 bunch Tuscan kale, center ribs and stems removed, cut into 1” strips; ½ teaspoon kosher salt plus more; ½ cup kimchi, chopped (optional); 1 teaspoon toasted sesame oil; Freshly ground black pepper