Chickpea Dumplings in Curried Tomato Sauce

Name: Chickpea Dumplings in Curried Tomato Sauce
Ingredients: 1 cup plus 2 tablespoons garbanzo bean (chickpea) flour (see Tip); 4 cups finely chopped mustard greens or spinach, divided; ⅓ cup canola oil plus 2 tablespoons, divided; ¼ cup finely chopped red onion; ¼ cup whole-milk plain yogurt; ¼ cup finely chopped serrano or jalapeño pepper; ½ teaspoon salt plus 1/8 teaspoon, divided; 2 teaspoons coriander seeds; 1 teaspoon cumin seeds; 1 teaspoon mustard seeds; 1 tablespoon curry powder; 1 tablespoon minced fresh ginger; 1 (15 ounce) can no-salt-added petite diced tomatoes, undrained; 1 (15 ounce) can no-salt-added tomato sauce