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Seafood Cassolette with Fragrant Coastal Herbs
Invite a quiet sense of French refinement to the table with this elegant seafood cassolette — a delicate composition of tender shellfish nestled in a silken white wine cream, finished beneath a lightly golden, gratinéed crust.
Begin by gently steaming the mussels in a splash of white wine with the garlic and thyme until they open. Discard any that remain closed, then strain and reserve the fragrant cooking liquour.
In a wide pan, melt the butter over a soft heat. Add the shallots and cook slowly until softened and translucent. Stir in the flour and cook briefly to form a smooth, pale roux.
Gradually pour in the white wine, followed by the seafood stock and cream, stirring continuously until the sauce becomes silky and lightly thickened. Allow it to simmer gently.
Stir through the Dijon mustard, thyme, and a seasoning of sea salt and freshly ground black pepper. Add the prawns, scallops, and white fish, allowing them to poach delicately in the sauce until just tender.
Fold in the mussels and finish with fresh parsley, ensuring everything is evenly coated in the velvety sauce. Spoon the mixture into individual ramekins or a single baking dish.
In a small bowl, combine the breadcrumbs, Gruyère, and melted butter. Scatter the mixture generously over the surface.
Bake in a preheated oven at 200°C for 12–15 minutes, until the topping is golden and crisp. For a deeper colour, finish briefly under the grill.
Serve immediately, while the filling is bubbling and the crust delicately crisp.
A few details make all the difference
01
Steam the Mussels Gently
Use a wide pan with a tight-fitting lid and remove each mussel as soon as it opens to prevent it becoming tough. Strain the cooking liquor through a fine sieve before adding it to the sauce, as it may contain grit or fragments of shell. Discard any mussels that remain closed after cooking.
02
Poach the Seafood Without Overcooking
Keep the cream sauce at a gentle simmer rather than a boil. Add the firm white fish first, followed by the scallops and prawns, then cook only until the seafood is just tender. The seafood will continue cooking in the oven, so avoid fully cooking it in the pan.
03
Create a Crisp Gruyère Crust
Mix the breadcrumbs, grated Gruyère and melted butter thoroughly so every crumb is lightly coated. Scatter the topping evenly without pressing it down, allowing the heat to circulate and create a crisp, golden crust.
Why this recipe works
Baked and served in individual dishes, it captures the charm of a classic bistro while offering a dish that feels both indulgent and intimate. Perfect for an understatedly luxurious supper, a romantic evening, or a beautifully considered starter for a special gathering.
Cook’s notes
Prepare in advance
This dish may be prepared in advance and assembled ahead of time, ready to be baked just before serving for effortless entertaining.
Replacing ingredients
For a more indulgent interpretation, consider replacing part of the seafood with tender lobster or sweet crab, adding an extra layer of richness and luxury.
Gluten-free
To accommodate gluten-free preferences, substitute with a suitable gluten-free flour and breadcrumbs without compromising the integrity of the dish.
Serve with...
Serve alongside a lightly dressed salad and warm, crusty bread to complement the creamy sauce and create a beautifully balanced plate.
Begin by gently steaming the mussels in a splash of white wine with the garlic and thyme until they open. Discard any that remain closed, then strain and reserve the fragrant cooking liquour.
In a wide pan, melt the butter over a soft heat. Add the shallots and cook slowly until softened and translucent. Stir in the flour and cook briefly to form a smooth, pale roux.
Gradually pour in the white wine, followed by the seafood stock and cream, stirring continuously until the sauce becomes silky and lightly thickened. Allow it to simmer gently.
Stir through the Dijon mustard, thyme, and a seasoning of sea salt and freshly ground black pepper. Add the prawns, scallops, and white fish, allowing them to poach delicately in the sauce until just tender.
Fold in the mussels and finish with fresh parsley, ensuring everything is evenly coated in the velvety sauce. Spoon the mixture into individual ramekins or a single baking dish.
In a small bowl, combine the breadcrumbs, Gruyère, and melted butter. Scatter the mixture generously over the surface.
Bake in a preheated oven at 200°C for 12–15 minutes, until the topping is golden and crisp. For a deeper colour, finish briefly under the grill.
Serve immediately, while the filling is bubbling and the crust delicately crisp.
Cook’s notes
Prepare in advance: This dish may be prepared in advance and assembled ahead of time, ready to be baked just before serving for effortless entertaining.
Replacing ingredients: For a more indulgent interpretation, consider replacing part of the seafood with tender lobster or sweet crab, adding an extra layer of richness and luxury.
Gluten-free: To accommodate gluten-free preferences, substitute with a suitable gluten-free flour and breadcrumbs without compromising the integrity of the dish.
Serve with...: Serve alongside a lightly dressed salad and warm, crusty bread to complement the creamy sauce and create a beautifully balanced plate.
Cooking mode
Seafood Cassolette with Fragrant Coastal Herbs
Begin by gently steaming the mussels in a splash of white wine with the garlic and thyme until they open. Discard any that remain closed, then strain and reserve the fragrant cooking liquour.
In a wide pan, melt the butter over a soft heat. Add the shallots and cook slowly until softened and translucent. Stir in the flour and cook briefly to form a smooth, pale roux.
Gradually pour in the white wine, followed by the seafood stock and cream, stirring continuously until the sauce becomes silky and lightly thickened. Allow it to simmer gently.
Stir through the Dijon mustard, thyme, and a seasoning of sea salt and freshly ground black pepper. Add the prawns, scallops, and white fish, allowing them to poach delicately in the sauce until just tender.
Fold in the mussels and finish with fresh parsley, ensuring everything is evenly coated in the velvety sauce. Spoon the mixture into individual ramekins or a single baking dish.
In a small bowl, combine the breadcrumbs, Gruyère, and melted butter. Scatter the mixture generously over the surface.
Bake in a preheated oven at 200°C for 12–15 minutes, until the topping is golden and crisp. For a deeper colour, finish briefly under the grill.
Serve immediately, while the filling is bubbling and the crust delicately crisp.
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