Tunisian Aromatic Fish Soup with Potatoes

Ingredients

• water
  4 cup
•  lb potatoes

  peeled, halved lengthwise, cut crosswise into1/2-inch-thick slices
  1 unit
• med tomatoes

  peeled, quartered
  2 unit
• x garlic cloves

  chopped
  3 unit
• tbl Chopped fresh mint
  2 unit
• tbl fresh lemon juice
  1 1/2 unit
• paprika
  1 tsp
• Ground cumin
  1/2 tsp
• Dried crushed red pepper
  1/4 tsp
• Plus 1 tablespoon finely chopped cilantro or parsley
  1/3 cup
•  lb Firm white fillets

  (such as cod, Haddock or sea bass) (1-inch-thick)
  1 unit
• tbl olive oil
  3 unit