Pescado al Guajillo al Horno (Baked Fish in Guajillo Sauce)
Thick white fish fillets baked on new potatoes in a red guajillo sauce, finished with sharp pickled onions.
Made with Pickled red onions (cebollas encurtidas) and Red enchilada sauce. Make a batch of the base first, then this takes minutes. Skip to the method
- Time50 min
- LevelEasy
- Costabout £2.40 a head
- Oven200°C (180°C fan)
Cost is worked out from Aldi and Tesco shelf prices in October 2026. Your shop and brands will differ.
Ingredients
Tick what you need to buy. It goes on your shopping list.
Method
- 1
Heat 200°C (180°C fan). Toss the potatoes, onion, garlic, oil and a good pinch of salt in a large baking dish. Roast for 20 minutes until the potatoes begin to soften.
20 min - 2
Warm your ready made red enchilada sauce (see the base recipe) and stir 150 ml through the potatoes.
- 3
Season the fish with salt and nestle it on top of the potatoes. Spoon the remaining 200 ml sauce over the fish.
- 4
Bake for 12 to 15 minutes until the fish is opaque and flakes easily and the potatoes are tender.
13 min 30 s - 5
Scatter over the pickled red onions and coriander and serve with the lime wedges.
Tips
- Slice the potatoes thinly and evenly so they cook through in the time the fish needs.
- Check the fish at 12 minutes. Thinner fillets need less time.
- The sharp pickled onions cut through the rich sauce, so do not skip them.
- Use sea bass or bream fillets in place of cod if you like.
Storing and freezing
Cool within 1 hour and keep in the fridge for up to 1 day. Reheat until steaming hot all the way through. Not suitable for freezing.
Questions
Can I use frozen fish?
Yes. Defrost it fully in the fridge overnight and pat dry before seasoning. Frozen fish can release extra water, so drain the dish before serving if needed.
Can I swap the potatoes?
Sweet potato slices work and need the same time. For a lower starch dish use thick courgette slices and add them with the fish.
Is the sauce hot?
It is mild to medium and fruity, not fiery. Serve extra chilli at the table.
What goes well with it?
A green salad and warm corn tortillas. A spoonful of crema is lovely if you do not need it dairy free.
More made with pickled red onions (cebollas encurtidas)
Chilaquiles Rojos con Camarón (Prawn Chilaquiles)
EFNFEmpanadas de Frijoles Refritos y Queso (Refried Bean Empanadas)
NFTacos de Hongos al Ajillo con Habanero (Garlic Mushroom Tacos)
DFEFNFTlayuda Oaxaqueña (Oaxacan Crisp Tortilla Pizza)
NFEFSee every dish made with pickled red onions (cebollas encurtidas)
Double check before you cook. Recipes can contain mistakes. Any diet labels come from the ingredients as written in this recipe and are a guide, not a guarantee. Always check every ingredient and the packet label for allergens and cross contamination, and ask your doctor or dietitian what is right for you, especially with coeliac disease, diabetes or a serious allergy. This is not medical advice.