Causa is Peru’s version of potato salad and it’s also one of my favorites. It seems unfair to compare it to the yellow, mayo-laden, eggy stuff we have here in the US. Causa is actually more like a cold gratin with layers of creamy pureed potatoes, tuna (or chicken or crab), avocado and a garnish of tart olives and hard-boiled eggs.
The recipe I found in a newspaper article from The Olympian is excellent and seems pretty close to authentic (at least to me). Especially helpful is the explanation on how to make aji amarillo (yellow Peruvian chile) paste with dried chilies. You can find a lot of “exotic” ingredients in Portland, but it’s still rather limited compared to the selection available in bigger cities. Here in San Francisco, I can buy frozen aji amarillos, but in Portland, I only found dried, which are available at Whole Foods. In any case, the recipe lists the chilies as optional, but I wouldn’t dream of leaving them out; they’re used a lot in Peruvian cooking and also provide a very particular spice, color and heat to the food.
In making this, I should have paid better attention to the ingredients list. First, I didn’t use Yukon gold potatoes, which are a must because of the characteristic yellow color and texture they give. I used regular baking potatoes, which I found too starchy and also a lot less pretty. Also, I forgot to garnish the top with olives and boil eggs; instead I used only chopped parsley.  Another thing I did differently, on purpose, is that I didn’t make mine in gratin form, but rather made mine maki-sushi style, i.e. rolled. I’ve seen it served both ways and since there was already so much food, I think the smaller pieces fit better.
I’ll definitely be making Causa again—it’s simple, comfort kind of food, which I love, but can be dressed up to be super elegant too.
Enjoy!
Rollos de Causa Rellenos con AtĂșn (adapted from an article found in The Olympian)
printable recipe
INGREDIENTS
Potato Paste
1 1/2 lbs Yukon gold potatoes (ca. 8-10), washed and scrubbed, but not peeled
1/4 cup vegetable oil
1/4 cup lime juice, or more if necessary
1 tbsp aji amarillo paste, optional
salt to taste
Filling
2 cans tuna, drained (I used white tuna in water)
1/2 cup mayonnaise
1 tbsp chives, finely chopped
1 tbsp parsley, finely chopped
1 tbsp red bell pepper, finely chopped (optional)
1/4 cup frozen corn, peas and carrots mix, thawed and drained
salt and pepper to taste
2 medium avocados, peeled and sliced thinly lengthwise
Garnish
3 hard boiled eggs, cut into wedges or sliced into rounds
6 kalamata olives
METHOD
For the Potato Paste
- Cook potatoes until tender. Peel when still warm, then put through a ricer. Mix riced potatoes with oil, salt and aji amarillo. Add lime juice and stir the mix until the dough is soft and well blended. Refrigerate at least 1 hour.
For the Filling
- Add mayonnaise, thawed vegetables, chives, cilantro, salt and pepper. Mix well and add salt if necessary.
For Assembly
- Maki-sushi style: Line a bamboo maki mat with plastic wrap. Spread a portion of the potato paste to the edges of the mat.
- Then, spread filling over the potato paste, leaving 1/4 inch space at each edge. Distribute evenly 1/4 of the avocado slices on top.
- Roll, pulling out the plastic as you go and wrapping it around the roll to finish. Repeat for remaining paste and filling. Place wrapped rolls on a platter and refrigerate. When ready to serve, unwrap and place back on platter. Slice into 1 1/2 inch pieces, sprinkle chopped parsley on top and serve.
- Traditional Squares: use a square baking pan, lightly oiled. Spread half of the potato paste in it, then spread the chicken filling. On top of the chicken filling spread the other half of the potato paste. Cover the baking pan and keep in the refrigerator until serving. Causa is a cold dish. When ready to serve, cut the causa into squares. With the help of a spatula, transfer each piece to a salad plate. Once on the plate, use the slices of avocado, egg and olives to decorate each piece. Each piece should have an olive and the same number of egg wedges and slices of avocado. (I didn’t add the olives or eggs; just topped mine with more chopped parsley)
Hint: You can make your own aji amarillo (yellow Peruvian chile pepper) paste with one pound of fresh aji amarillo and 2 tablespoons of vegetable oil. Place aji in a saucepan with water and boil for 5 minutes. Change the water and repeat procedure twice. Cut, seed and devein ajies. You can peel some ajies to reduce spiciness. Blend with oil until you get a creamy paste.
As an alternative to fresh aji amarillo, you can use dried chilli-peppers (known as dried aji mirasol), which are easier to find outside of Peru. The procedure is similar to the fresh ajĂes, just add some water when blending until you get the creamy paste.