Oaty Fish & Prawn Gratin Recipe

Introduction

This oaty fish and prawn gratin is a light yet satisfying dish perfect for a nutritious dinner. Combining tender white fish, succulent prawns, and fresh spinach, it’s topped with a golden, crunchy oat and parmesan crust. Serve it alongside steamed broccoli for a wholesome meal that’s easy to prepare and full of flavor.

Ingredients

• 340g bag baby spinach, roughly chopped
• 400g can chopped tomatoes with garlic and herbs
• 225g sustainable white fish fillets, chopped into large chunks
• Small bunch basil, shredded
• 100g cooked and peeled prawns
• 2 tbsp finely grated parmesan
• 2 tbsp breadcrumbs
• 2 tbsp oats
• 170g broccoli, boiled or steamed, to serve

Instructions

1. Step 1: Place the spinach in a large colander and pour over boiling water. Once it is cool enough to handle, squeeze out any excess water and season lightly with salt and pepper.
2. Step 2: Pour the chopped tomatoes into a frying pan, season, and simmer for 5 minutes to thicken. Add the white fish chunks and heat for 1–2 minutes until the fish starts to firm up but is not fully cooked. Stir in the shredded basil.
3. Step 3: Preheat your oven to 220°C (200°C fan) or gas mark 7. Divide the spinach, fish and tomato mixture, and prawns evenly between two gratin dishes.
4. Step 4: Combine the parmesan, breadcrumbs, and oats in a small bowl. Sprinkle this mixture evenly over the top of the gratins to form a crust.
5. Step 5: Bake in the preheated oven for 20 minutes, or until the topping is golden and bubbling. Serve hot with the boiled or steamed broccoli on the side.

Tips & Variations

• For extra flavor, add a squeeze of lemon juice to the tomato sauce before baking.
• Try swapping oats for crushed crackers or panko breadcrumbs for a different texture.
• Use any firm white fish like cod, haddock, or pollock, ensuring it holds well in the gratin.
• If you prefer a richer sauce, stir in a spoonful of crème fraîche or cream after simmering the tomatoes.

Storage

Store any leftovers in an airtight container in the refrigerator for up to 2 days. Reheat gently in an oven set to 180°C until warmed through to keep the topping crisp. Avoid microwaving to prevent sogginess.

How to Serve

Serve this delicious recipe with your favorite sides.

FAQs

Can I prepare the gratin ahead of time?

Yes, you can assemble the gratin up to a day in advance and keep it covered in the fridge. Bake just before serving to ensure a crispy topping.

Can I use frozen prawns for this recipe?

Frozen cooked prawns can be used; just make sure they are fully thawed and drained before adding to the gratins to avoid extra moisture.

Oaty Fish & Prawn Gratin Recipe

---

★★★★★

4.9 from 126 reviews

• Author: Ethan
• Total Time: 40 minutes
• Yield: 2 servings 1x
• Diet: Low Fat

Pin Recipe

Print Recipe

Description

A comforting and nutritious seafood gratin featuring tender white fish, succulent prawns, and a flavorful tomato and spinach base, topped with a crispy oat and parmesan crust. Perfectly baked to golden perfection and served with steamed broccoli for a wholesome meal.

---

Ingredients

Scale 1x2x3x

Main Ingredients

• 340g baby spinach, roughly chopped
• 400g can chopped tomatoes with garlic and herbs
• 225g sustainable white fish fillets, chopped into large chunks
• small bunch basil, shredded
• 100g cooked and peeled prawns

Topping

• 2 tbsp finely grated parmesan
• 2 tbsp breadcrumbs
• 2 tbsp oats

To Serve

• 170g broccoli, boiled or steamed

---

Instructions

1. Prepare the Spinach: Place the chopped spinach in a large colander and pour boiling water over it to wilt. Once it’s cool enough to handle, squeeze out the excess water to prevent a watery gratin. Season the spinach with salt and pepper to taste.
2. Make the Tomato Sauce: Pour the canned chopped tomatoes with garlic and herbs into a frying pan. Season with salt and pepper, then simmer gently for about 5 minutes, allowing the sauce to thicken slightly.
3. Add Fish and Basil: Add the chunks of sustainable white fish to the tomato sauce and heat for 1-2 minutes until they start to firm up but are not fully cooked. Stir in the shredded basil to infuse the sauce with fresh aroma.
4. Preheat the Oven: Heat the oven to 220°C (200°C fan)/Gas Mark 7 to prepare for baking the gratins.
5. Assemble the Gratin: Divide the squeezed spinach evenly between two gratin dishes. Spoon the fish, prawn, and tomato sauce mixture over the spinach layers.
6. Create the Topping: In a small bowl, mix together the parmesan, breadcrumbs, and oats. Sprinkle this mixture evenly over the fish and tomato layer in each gratin dish to create a crispy topping.
7. Bake: Place the gratin dishes in the preheated oven and bake for 20 minutes or until the topping is golden brown and bubbling hot.
8. Serve: Remove from the oven and serve immediately alongside the boiled or steamed broccoli for a delicious and balanced meal.

Notes

• Ensure to squeeze out all excess water from the spinach to avoid a soggy gratin.
• Use sustainable fish varieties for an environmentally friendly dish.
• If you prefer, you can substitute the prawns with other seafood such as scallops or crab meat.
• For extra flavor, add a pinch of chili flakes into the tomato sauce while simmering.
• Using oats in the topping adds a nutritious twist and contributes to a crunchy texture.
• Broccoli can be steamed or boiled lightly to retain its vibrant color and crunch.

• Prep Time: 15 minutes
• Cook Time: 25 minutes
• Category: Main Course
• Method: Baking
• Cuisine: British

Keywords: fish gratin, prawn gratin, seafood bake, spinach gratin, healthy seafood dish, baked fish, parmesan topping, oat crust