De Tokio a Lima Palma is a vibrant Nikkei-style causa that layers a creamy, lime-kissed potato base with a silky tuna tartare and a bright, spicy aji amarillo sauce. This dish brings together the best of Peruvian and Japanese cooking—the comforting, earthy potato cake of a classic causa with the clean, fresh flavors of a Japanese poke-style topping. It works beautifully as an elegant starter or a light main course, and while it looks impressive, it comes together with just a few key components and a little patience for chilling.
Ingredients
- 2 lb (900 g) Yukon Gold or yellow potatoes, peeled and quartered
- 3 tbsp (45 ml) fresh lime juice, plus more for the tuna
- 2 tbsp (30 ml) aji amarillo paste (or substitute 1 tbsp yellow curry paste + 1 tsp lime juice)
- 1/2 cup (120 ml) mayonnaise
- 2 tbsp (30 ml) olive oil
- 1 tsp (5 g) salt, plus more to taste
- 1 lb (450 g) sushi-grade tuna (see Tips for safety)
- 1 small red onion, thinly sliced
- 1 avocado, sliced
- 1/4 cup (60 ml) soy sauce
- 1 tbsp (15 ml) toasted sesame oil
- 1 tsp (5 g) grated fresh ginger
- 1 tsp (5 g) sugar
- 1/4 cup (60 ml) mayonnaise (for the sauce)
- 2 tbsp (30 ml) aji amarillo paste (for the sauce)
- 1 tbsp (15 ml) fresh lime juice (for the sauce)
- 1/4 cup (60 ml) finely chopped cilantro, for garnish
- 1/4 cup (60 ml) toasted sesame seeds, for garnish
Instructions
- Place the potatoes in a large pot and cover with cold water. Add a generous pinch of salt. Bring to a boil over high heat, then reduce to medium and simmer until the potatoes are tender when pierced with a fork, about 15–20 minutes. Drain and let cool just until warm enough to handle.
- While the potatoes cook, prepare the tuna tartare: cut the tuna into small dice (about 1/4-inch cubes). In a bowl, combine the tuna with 1 tbsp (15 ml) lime juice, 1 tbsp (15 ml) soy sauce, and 1 tsp (5 g) sugar. Toss gently and refrigerate while you assemble the rest.
- For the potato base: in a large bowl, mash the warm potatoes until smooth. Add the 3 tbsp (45 ml) lime juice, 2 tbsp (30 ml) aji amarillo paste, 1/2 cup (120 ml) mayonnaise, olive oil, and salt. Mix until well combined and creamy. Taste and adjust salt if needed.
- Line a 9-inch (23 cm) round cake pan or springform pan with plastic wrap. Press the potato mixture evenly into the bottom of the pan, smoothing the top. Cover and refrigerate for at least 30 minutes to firm up.
- Meanwhile, make the aji amarillo sauce: whisk together the 1/4 cup (60 ml) mayonnaise, 2 tbsp (30 ml) aji amarillo paste, and 1 tbsp (15 ml) lime juice in a small bowl. Set aside.
- In a small bowl, combine the sliced red onion with 1 tbsp (15 ml) lime juice and a pinch of salt. Let it sit for 5 minutes to mellow the sharpness.
- Once the potato base is chilled and firm, carefully invert it onto a serving plate. Peel off the plastic wrap.
- Top the potato base with the marinated tuna, spreading it evenly. Arrange the avocado slices and pickled red onion on top.
- Drizzle the aji amarillo sauce over the top, then garnish with cilantro and sesame seeds. Serve immediately.
Tips
- Potato texture: For a smooth, lump-free base, pass the cooked potatoes through a ricer or mash them thoroughly while still warm. Cold potatoes will be gluey.
- Aji amarillo substitute: If you can’t find aji amarillo paste, use a mix of yellow curry paste and lime juice (as listed) or a blend of yellow bell pepper and a pinch of cayenne. The flavor will be slightly different but still delicious.
- Tuna safety: Since this dish uses raw fish, it’s crucial to buy sushi-grade tuna from a trusted source. Ask your fishmonger if the fish has been frozen according to FDA guidance (-4°F / -20°C for 7 days) to kill potential parasites. If you’re pregnant, very young, elderly, or have a weakened immune system, choose a cooked version (see Variations).
- Chilling is key: Don’t skip the chilling step—it makes the potato base firm enough to slice cleanly. If you’re short on time, freeze it for 15 minutes instead.
Serving Suggestions
Serve the causa as a stunning first course for a dinner party, paired with a crisp white wine like Sauvignon Blanc or a light lager. It also works well as a main dish for lunch, accompanied by a simple green salad with a citrus vinaigrette. For a more casual spread, cut it into wedges and serve on a platter with extra lime wedges on the side.
Variations
- Cooked version: For a fully cooked option, replace the raw tuna with grilled or seared tuna (cook to 145°F / 63°C) or use cooked shrimp, chopped. This is a safer choice for those who prefer to avoid raw fish.
- Vegetarian: Substitute the tuna with diced, roasted sweet potato or a mix of sautéed mushrooms and edamame. The marinade will still add a savory kick.
- Spicy twist: Add a finely chopped fresh chili (like serrano or bird’s eye) to the tuna marinade for extra heat, or stir some sriracha into the aji amarillo sauce.
- Different potato base: Try using purple potatoes for a striking color contrast. They have a slightly earthier flavor but work just as well.
Storage and Reheating
This dish is best enjoyed fresh, but you can store leftovers in an airtight container in the refrigerator for up to 1 day. The potato base will absorb moisture and soften, so it’s not ideal for long-term storage. To store, cover the assembled causa tightly with plastic wrap and refrigerate. Do not freeze, as the texture will suffer. If you have leftover components, store them separately: the potato base and sauce can be refrigerated for up to 3 days, and the tuna tartare should be consumed the same day it’s made. To serve leftovers, simply assemble again—no reheating is needed, as this is a cold dish.
Frequently Asked Questions
Can I make this ahead of time? Yes, you can prepare the potato base and the sauce up to 2 days ahead and keep them refrigerated. Assemble the dish just before serving to keep the tuna fresh and the potato base firm.
What is aji amarillo paste? Aji amarillo is a yellow Peruvian chili pepper. The paste is available in Latin grocery stores or online. It has a fruity, slightly spicy flavor that is essential to many Peruvian dishes. If you can’t find it, the substitute listed in the ingredients works well.
Is it safe to eat raw tuna? Raw fish always carries some risk. To minimize it, buy sushi-grade tuna that has been frozen to FDA guidelines (-4°F / -20°C for 7 days). Pregnant women, young children, older adults, and those with compromised immune systems should avoid raw fish and choose a cooked version instead.
Why is my potato base too soft? This usually happens if the potatoes are over-mashed or if you add too much liquid. Make sure to drain the potatoes well after boiling and let them steam dry for a minute before mashing. Also, don’t overmix the base—just combine until smooth.
Can I use canned tuna? Canned tuna won’t give the same texture or flavor, but in a pinch you can use well-drained canned tuna (in water or olive oil). It will be more like a tuna salad, so adjust the seasoning to taste.
How do I slice the causa cleanly? Use a sharp, thin-bladed knife and wipe it clean between cuts. For the neatest slices, chill the assembled causa for another 30 minutes after topping with the tuna, then slice with a gentle sawing motion.
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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes
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