Assuming you ate the oranges and kept the peels:
Hawaiian Style Oxtail Soup
2 pounds oxtails
5 quarts water
4 cans chicken broth
1 piece dried orange peel
2 star anise
2 (1 inch) pieces of fresh ginger, thinly sliced
½ cup raw peanuts, remove shell and skin
5 pieces dried shiitake mushroom, soaked and sliced
Hawaiian salt, to taste
1 small bunch Chinese mustard cabbage, rough cut into 1½ inch sections
Garnish:
Optional: Chinese parsley or green onions
In a large pot, add oxtails and water; bring to a boil. As the water is boiling skim off excess fat and bring down to a simmer. Continually remove impurities and then drain water.
Next, add chicken broth, star anise, and ginger; bring to a boil and lower heat to a simmer. Cook for about an hour and skim off excess fat throughout to have a clearer broth.
Add in raw peanuts, shiitake mushrooms and Hawaiian salt and simmer for about 1½ hours.
Add mustard cabbage, orange peel and garnish individual servings with Chinese parsley.