Persian Fish With Barberry Sauce: Seafood Zereshk Polo

Ingredients

• 1 x 300g piece mahi mahi fillet, skin off, pin-boned
• 1 tablespoon extra virgin olive oil
• 1 brown onion, diced
• 25g butter
• 1 clove garlic, crushed
• 1/4 teaspoon ground turmeric
• 1 tablespoon tomato paste
• 2/3 cup water
• 1 tablespoon lemon juice
• 2 teaspoons dried barberries
• Pinch saffron threads
• Steamed rice, for serving