ramen broth recipe

Ingredients: 2 tablespoons vegetable oil 2 large onions, sliced 4 cloves garlic, smashed 1-inch piece of ginger, sliced 4 green onions, chopped (white and green parts separated) 1 pound pork bones (neck bones or spare ribs work well) 6 cups water 4 cups chicken broth 1/4 cup soy sauce 2 tablespoons miso paste