Remove from the oven and keep warm. Any residual juices left in that dish can be added to the sauce. Warm the sauce and pour on to a dish. Place the fillets of hake on the sauce and serve swiftly.
Season to taste and stir in the dill. Reheat the sauce and pour over the meatballs. Sprinkle with the remaining parsley and dill and serve with the mash.
They will not only flavor the butter sauce, but they will also lightly flavor your fish as it poaches. You can also never go wrong with bay leaves, chives, dill, and parsley, classic herb ...