Ingredients (Serves 4)
Preheat the oven to 200°C, 400°F, Gas 6. Line a baking tray or dish with a sheet of aluminium foil then place the haddock fillets on top.
Mix together 1 tbsp of lemon juice and 1 tbsp of olive oil then pour over the fish. Place another piece of foil over the fish and seal the edges to form a parcel. Bake for 15 minutes.
Meanwhile, mix together the tahini and garlic. In another bowl, combine the remaining lemon juice and the water. Slowly add the lemon juice mix to the tahini, beating until smooth and creamy. Season to taste.
Pan-fry the onions in the remaining olive oil until brown and almost crispy.
Remove the fish from the oven and pull off the top piece of foil. Place the onions around the fish then pour the tahini mix over the top. Bake for a further 15 minutes, or until the top is bubbling and golden (do not replace the foil as this will stop the fish browning).
Serve with couscous or rice and a herb salad.