01 - 
                Preheat oven to 190°C and lightly grease a baking dish.
              
              
              
                02 - 
                Arrange smoked haddock fillets in the prepared baking dish. Season with salt and black pepper. Bake for 15–20 minutes, until just cooked and flaking.
              
              
              
                03 - 
                While the fish bakes, melt butter over medium heat in a large skillet. Add shallot and garlic, sauté until soft and fragrant.
              
              
              
                04 - 
                Add spinach to the skillet and cook until just wilted. Season with salt and black pepper to taste.
              
              
              
                05 - 
                In a separate saucepan, gently heat heavy cream over low heat. Whisk in Dijon mustard and cook, stirring, until sauce thickens slightly.
              
              
              
                06 - 
                Divide buttered spinach among serving plates. Top with baked smoked haddock fillets and spoon the mustard sauce over each portion.