Codfish and sweet potato creamy soup - Riberalves

Ingredients

• 1 cup deep-frozen soaked cooked codfish Riberalves
• 500 g of sweet potato
• 1 onion
• 4 tomatoes
• 2 cups of cream
• 5 tablespoons of butter
• 4 cups of beef broth
• 2 tablespoons of coriander
• 1 tablespoon of flour
• Nutmeg
• salt