The Spanish name for this soup is sopa cachorreña - Seville Orange soup - and it's good served
post-Christmas, when bitter Seville oranges are in season.  January and February 2017 were good months for soups! I had my jaw surgery then (Gus).

Spanish Fish Soup with Orange

Ingredients

2 1/2 pounds white fish i.e. cod
5 cups water
4 bitter oranges or 4 sweet oranges and 2 lemons
2 tablespoons olive oil 
5 garlic cloves, unpeeled
1 large onion, finely chopped
1 can of diced tomatoes
4 small potatoes, chopped into small cubes
1 teaspoon paprika
salt and ground black pepper
1-2 tablespoons finely chopped fresh parsely

Steps

1. Heat the oil over high heat and add in the smashed garlic and onion. Cook until onion is softened. 
2. Add in the diced tomatoes, then shortly after add the 5 cups of water and bring to a boil. 
For extra orange flavor add orange rind to the soup.

​3. Next, add the potatoes and cook for about 5 minutes. Then, add the fish pieces and cook for another 15 minutes. 
4. Add the squeezed orange juice, the paprika, and salt and pepper to taste. Serve with parsley.