SpanishMedium · Hot
Sardine and Potato Gratin with Paprika Breadcrumb Crust
A rustic Atlantic gratin where tender potato slices nestle between soft sardines, blanketed in a gentle milk and butter sauce, finished with a smoky paprikabreadcrumb crust that turns golden under the heat.
Prep
20 min
Cook
40 min
Rest
5 min
Total
1h 5m
Method
Prep
1
Preheat your oven to 180°C. Peel the potatoes and slice them into rounds about 5mm thick. Peel and finely dice the yellow-onion. Finely mince the garlic cloves.
2
If using fresh sardines, clean and bone them, or use canned sardines drained. Break them into large, bite-sized pieces.
3
Grate the cheddar cheese. Mix the breadcrumbs with the paprika, minced garlic, and olive oil for the crust. Set aside.
Building the Gratin
4
Warm 3 tablespoons of olive-oil in a wide oven-safe skillet or Dutch oven over medium heat. Add the diced onion with a pinch of salt and cook gently for 5 minutes until softened and translucent.
5
Add the minced garlic and cook for another minute until fragrant.
6
7
Pour the whole-milk over the layers. Dot with butter and scatter the grated cheddar across the top.
8
[object Object]
B
Nutri-Score
Good balance
A–E · lower is better · score 1
Calories
762
per serving
High in protein · 39gLow sugar · 7g
Protein
39g
Carbs
50g
Fat
45g
Sat. fat
17g
Fiber
6g
Sugar
7g
Sodium
1286mg
Heart HealthyBone SupportOmega 3 RichLow InflammatoryHigh ProteinBalanced MacrosSustainable ProteinLow Sugar
Nutri-Score is a general nutritional-balance guide, not medical or dietary advice.
Grade pending
Environmental impact
Estimated footprint
Grade pending · 77% ingredient coverage
kg CO2e
≥1.0
per serving
cheddar-cheese drives 47% of this recipe’s estimated footprint.
Carbon from Poore & Nemecek 2018; water, land & runoff from Agribalyse — modelled averages for comparing recipes, not a measurement of your groceries.
Flavor Profile
7
Umami
4
Sweet
5
Salty
2
Sour
2
Bitter
4
Spicy
Textures
CrispyTenderCreamyMelty
Aromas
SmokyBrinyButteryHerbal
Kitchen Equipment
Primary Tool
Dutch OvenDutch OvenOvenChef KnifeCutting BoardGraterMixing BowlWooden SpoonAluminum FoilOlive Oil For Drizzling
Counter FootprintMedium
Techniques
Safety & Storage
Cooking Temperature
Bake gratin at 180°C for 25 minutes until potatoes are tender and bubbling, then finish at 200°C for 10-12 minutes to achieve safe internal temperature for fish (63°C/145°F minimum).
Cross Contamination
If using fresh sardines, keep them separate from other ingredients during prep. Use separate cutting boards for fish and vegetables, or wash thoroughly between uses to prevent bacterial transfer.
Storage
Refrigerate leftovers within 2 hours of cooking in airtight containers. The combination of fish and dairy makes this dish highly perishable and requires prompt cooling.
Shelf Life
Consume refrigerated leftovers within 2-3 days for optimal quality and safety. Do not leave at room temperature for more than 2 hours total.
Allergen Warning
This dish contains fish, milk/dairy, and gluten. Clearly label and separate from allergen-free dishes during preparation and serving to prevent cross-contact.
High Risk Population
Pregnant individuals, young children, elderly, and immunocompromised persons should ensure fish is cooked thoroughly to internal temperature of 63°C/145°F to eliminate parasites and bacteria.
Handling
If using canned sardines, check for damage or bulging cans before use. For fresh sardines, ensure proper cleaning and removal of bones before incorporating into the dish.
The dairy-based cream sauce creates an ideal medium for bacterial growth if not properly heated and held at safe temperatures. Ensure even heating throughout when reheating leftovers.
Pro Tips
Technique
Don't rush the first bake — let the potatoes soften and absorb the milk completely before adding the crust. The sardines should barely hold together, almost melting into the layers like they do in my grandmother's pot.
Substitution
If you can't find fresh sardines, good quality canned ones work beautifully. And if smoked mackerel is what you have, it will give you that deeper, oilier flavor we love along the rías.
From the chef
Soft potato slices and sardines baked together in milk make humble, honest food — the kind that asks nothing of you but time and a decent oven. The paprika breadcrumb crust goes on in the last ten minutes, catching the heat and turning golden while the layers underneath finish drinking in each other's brine. Sea and earth cooking together, patient and unhurried. There is a conversation in this dish that my grandmother understood before I did, and a drizzle of good olive oil at the end is all the finish it needs.
TagsComfort FoodSeafoodPotatoBakedOne DishRusticSmoked Paprika
AllergensFishMilkGluten
Source: generated · June 10, 2026