Causa rellena is a chilled Peruvian potato cake layered with seasoned mashed Yukon Golds and a lime-spiked tuna filling, finished with avocado, hard-boiled egg, and olives. The whole thing comes together in about an hour, and most of that is hands-off boiling time. It serves four as a light main or six as a starter, and it holds in the fridge overnight โ which makes it one of the more practical composed dishes you can pull off on a weeknight.
Why this recipe works
Two things carry this dish. First, the potato base is seasoned while still warm โ thatโs when it absorbs the ajรญ amarillo paste, lime juice, and oil most effectively. Cold mashed potatoes resist seasoning and turn dense. Second, the tuna filling uses just enough mayonnaise to bind without drowning the lime and onion. That balance keeps the filling tasting bright rather than heavy, which matters because the potato layer is rich on its own. Get both of those right and the layers actually contrast each other instead of blending into one flat flavor.
If something goes sideways
- The potato layer is sticky and wonโt hold its shape: You likely over-mashed or added the oil too fast. Next time, rice the potatoes and fold the oil in slowly. For now, chill the mixture for 20 minutes โ it firms up considerably and becomes much easier to press into layers.
- The layers slide apart when you unmold: The filling was probably too wet. Drain canned tuna thoroughly and press it in a sieve before mixing. A wetter filling also makes the bottom potato layer soggy within a few hours.
- The avocado garnish turns brown before serving: Slice it right before plating and rub each piece with a little lime juice. Donโt slice ahead and refrigerate uncovered โ it oxidizes fast.
- The dish tastes flat even after seasoning: Ajรญ amarillo paste varies a lot by brand. If yours seems mild, add a small squeeze of extra lime and a pinch more salt โ acid does more work here than additional paste.
- The ring mold wonโt release cleanly: Run a thin knife around the inside edge before lifting. If you donโt have a ring mold, a loaf pan lined with plastic wrap works well and unmolds easily by lifting the plastic.
Ingredient notes
- Ajรญ amarillo paste: Find it at Latin grocery stores or online. Itโs mildly fruity and moderately spicy โ not a direct swap for any other chili paste. In a pinch, a small amount of jarred roasted yellow pepper blended with a little hot sauce gets you partway there, but the flavor wonโt be the same.
- Tuna in olive oil: Worth using here. Water-packed tuna is drier and blander, and the filling needs the fat to stay cohesive. Kewpie mayo is a good call if you have it โ itโs richer and slightly tangier than standard American mayo.
- Botija olives: A Peruvian black olive โ briny and slightly soft. Kalamata is a fine substitute. Standard canned black olives are too mild and watery; skip them.
Keeping leftovers crisp
Store the assembled causa covered tightly with plastic wrap pressed directly against the surface โ this slows oxidation on the avocado and keeps the potato from drying out. It keeps well for up to 24 hours in the fridge; after that the potato layer starts to weep and the avocado deteriorates. If youโre making it ahead, assemble the potato and tuna layers up to a day in advance but add the avocado, egg, and olive garnishes right before serving โ keep those components separate in the fridge. The tuna filling itself can be made up to two days ahead. One firm call: add the garnishes at the table, not an hour before. A pre-garnished causa sitting in the fridge loses its visual contrast and the avocado goes dull fast.
Peruvian Causa Salad (Layered Potato and Tuna)
Equipment
- Medium pot
- Mixing bowls
- Potato Masher or Ricer
- 8-inch Ring Mold or Springform Pan (optional)
- Rubber Spatula
- Knife and cutting board
Ingredients
For the Potato Layer:
- 2 lb Yukon gold potatoes peeled and cut into chunks. Choose starchy potatoes for a velvety mash.
- 3 tbsp vegetable oil preferably sunflower or avocado oil
- 2 tbsp ajรญ amarillo paste can be found in Latin markets or online. Mildly spicy and fruity.
- 2 tbsp fresh lime juice plus more to taste
- 1 tsp salt to taste
For the Tuna Filling:
- 2 cans tuna in olive oil drained; preferably high quality tuna
- ยผ cup mayonnaise homemade or a good quality mayo like Kewpie
- 1 tbsp red onion finely minced for brightness
- 1 tbsp fresh lime juice adjust to taste
- ยผ tsp freshly ground black pepper
For the Garnishes:
- 1 medium avocado sliced thinly
- 2 large hard-boiled eggs sliced into rounds
- ยผ cup black olives preferably Botija or Kalamata, pitted and halved
- 1 tbsp chopped parsley or chive for a final herbaceous touch
Instructions
- Cook the Potatoes: Place the peeled and chopped potatoes in a medium pot and cover with cold water. Add a generous pinch of salt. Bring to a boil, then simmer for 12โ15 minutes, or until tender when pierced with a fork. Drain and let cool slightly.
- Mash and Season Potatoes: While still warm, mash the potatoes with a potato masher or ricer until smooth (do not overmix to avoid gumminess). Mix in vegetable oil, ajรญ amarillo paste, lime juice, and salt. Taste and adjust seasoning if needed.
- Prepare Tuna Filling: In a medium bowl, combine the drained tuna, mayonnaise, minced onion, lime juice, and ground black pepper. Mix well and set aside.
- Assemble the Causa: Using an 8-inch ring mold or springform pan (or freehand on a plate), layer half of the mashed potato as a bottom layer, smoothing with a spatula. Gently press the tuna mixture over the potatoes. Top with the remaining mashed potato and smooth the surface.
- Garnish: Arrange avocado slices, hard-boiled egg rounds, black olives, and chopped parsley or chives artfully on top. Chill for at least 15 minutes before serving for clean slicing.
Notes
- Substitute ajรญ amarillo paste with a blend of yellow bell pepper and mild chili paste if unavailable (note: flavor will differ).
- For a vegetarian version, use smashed chickpeas or hearts of palm in place of tuna.
- For perfectly smooth mashed potatoes, use a ricer and avoid overmixing.
- Make it into mini individual causa towers using ramekins.
Nutrition
Your questions, answered
Can I make causa rellena without a ring mold?
Yes โ a loaf pan lined with plastic wrap works perfectly. Press the potato and filling layers in, fold the plastic over the top, chill for at least 30 minutes, then lift the whole thing out by the plastic and slice it like a terrine.
Where do I find ajรญ amarillo paste?
Most Latin grocery stores carry it in the condiment or international aisle. Itโs also widely available online. The paste is more convenient than fresh ajรญ amarillo peppers and gives consistent results.
Can I use canned tuna in water instead of tuna in olive oil?
You can, but the filling will be drier and less flavorful. Add an extra teaspoon of olive oil to the filling to compensate, and taste carefully for seasoning since water-packed tuna is blander.
How far ahead can I assemble this?
Assemble the potato and tuna layers up to 24 hours ahead and refrigerate covered. Hold the avocado, egg, and olive garnishes separately and add them just before serving.
My potatoes came out gluey โ what happened?
Over-mixing releases too much starch and makes mashed potatoes gummy. Mash only until smooth and stop โ a few small lumps are better than a paste. A ricer gives the most reliable texture.
Can I substitute the tuna with something else?
Shredded rotisserie chicken mixed with the same mayo, lime, and onion works well and is fast. Crab or cooked shrimp are traditional Peruvian variations too โ just chop the shrimp finely so the filling holds together when sliced.