2) Taste and adjust the seasoning if desired. Add the fish and gently mix to combine.
To make the oil poached flounder:
1) Preheat the oven to 180C/Gas 4. In a medium saucepan over low heat, bring the olive oil to 150C.
2) While the oil is heating, season the flounder fillets on all sides with salt and freshly ground black pepper. Lay half the sliced lemons and half the parsley in the bottom of a cast iron skillet large enough to hold the fillets in a single layer without overlapping. Lay the seasoned fillets on top of the lemons. Top with the remaining lemons and parsley.
3) Once the oil has reached temperature, gently pour it over the fillets, place in the oven and poach for 10 minutes. Allow to cool for 5 minutes before serving.