Prawn and Leek Gratin
Why this recipe works
- Balanced creamy flavour: Dijon mustard and lemon cut through the double cream, keeping the sauce rich without tasting heavy.
- Crisp topping, soft filling: Tender leeks and juicy prawns sit under a golden layer of mature cheddar and breadcrumbs.
- Straightforward method: The filling is made in one pan before baking, so the oven finishes the sauce, prawns and topping together.
Get the most out of this recipe
Timing notes
- Serve after a short rest: Let the gratin stand for 5 minutes after baking so the sauce settles slightly but remains hot and spoonable.
- Watch the prawns: Raw prawns are done when opaque all the way through; if using cooked prawns, reduce the baking time and heat only until piping hot.
Texture tips
- Keep the cream gentle: Simmer the cream lightly before baking rather than boiling hard, which can make the sauce split.
- For a lighter crust: Panko breadcrumbs can be used instead of standard breadcrumbs for a looser, crunchier topping.
Ingredient notes
- Use mature cheddar: A mature cheddar gives the topping a stronger savoury flavour, so the gratin tastes well seasoned without needing a heavy layer of cheese.
- Lemon lifts the sauce: Add the zest for fragrance and enough juice to brighten the cream without making it sharp.
Make-ahead tips
- Reheat gently: Reheat leftovers in a 180°C (355°F) oven until piping hot, covering loosely if the breadcrumb topping browns too quickly.
- Best freshly baked: The gratin is at its best on the day it is made, when the prawns are tender and the topping is crisp.
Equipment you'll need
Ingredients
Instructions
- Heat the oven to 200°C (390°F). Trim the leeks, halve lengthways, then rinse well and slice into 1 cm pieces.
- Melt the butter in a frying pan over a medium heat. Add the leeks with the salt and pepper, then cook for 10 to 12 minutes, stirring often, until soft and sweet but not browned.
- Finely grate or crush the garlic and stir it into the leeks for 30 seconds until fragrant. Pour in the double cream and whisk in the Dijon mustard, then bring to a gentle simmer for 2 minutes to lightly thicken.
- Finely grate the lemon zest into the pan, then squeeze in about 1 tablespoon of lemon juice. Take off the heat and stir in the prawns so they are well coated.
- Tip the mixture into a baking dish and level the top. Grate the cheddar cheese over, then scatter over the breadcrumbs.
- Bake for 15 to 18 minutes until bubbling at the edges and golden on top, and the prawns are opaque all the way through. Rest for 5 minutes before serving so the sauce settles slightly.
Recipe notes
Serving suggestions
This recipe pairs well with:
Tips
- If your prawns are already cooked, add them after the cream has simmered and bake just 10 to 12 minutes, until the gratin is bubbling and hot throughout.
- Keep the cream at a gentle simmer before baking; boiling can cause it to split.
- If serving to pregnant people, young children, older adults, or anyone immunocompromised, make sure the prawns are cooked until fully opaque and piping hot throughout.
Substitutions
- Replace Cheddar cheese with Gruyere cheese for a nuttier, more mellow topping.
- Replace Dijon mustard with Whole-grain mustard for a milder heat and a little texture.
- Replace Breadcrumbs with Panko breadcrumbs for a lighter, crunchier crust.
Storage
- Refrigerate up to 2 days
- Cool, cover and refrigerate. Reheat in a 180°C (355°F) oven for 15 to 20 minutes until piping hot; cover loosely if the top is browning too quickly.
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Recipe overview
- Servings: 3 servings
- Total time: 45min (20min active)
- Difficulty: Easy
- Cuisine: British
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Allergens:
Crustaceans Gluten Milk
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