Causa Rellena on Carpet: Removing Peru's Yellow Potato and Ají Amarillo Dish

What Causa Rellena Leaves on Carpet

Causa rellena (also causa limeña — from Lima, or simply causa) is one of the most distinctive and visually striking dishes of Peruvian coastal cuisine. It is a cold dish assembled from layers of papa amarilla — the characteristic yellow-fleshed Peruvian potato (a starchy, waxy variety with a naturally vivid egg-yolk yellow colour from high carotenoid content) mashed with freshly squeezed lime juice, vegetable oil, salt, and ají amarillo paste (pasta de ají amarillo — the paste made from the quintessential Peruvian yellow-orange chili pepper, Capsicum baccatum). The ají amarillo is the single most important flavouring ingredient in Peruvian cooking — it appears in more Peruvian dishes than any other single ingredient and gives causa its characteristic vivid golden-orange colour (from capsanthin, a xanthophyll carotenoid, and from the naturally yellow-orange flesh of the pepper). This potato-ají amarillo layer is pressed into a mould or dish, filled with a mixture of shredded cooked tuna in mayonnaise (atún con mayo) or shredded poached chicken in mayonnaise (pollo con mayo), with sliced boiled egg and olive, then covered with another potato layer and turned out or served as assembled. The vivid yellow-orange of the causa makes it one of the most visually striking Peruvian dishes and one of the easiest food stains to identify on carpet.

What You Will Need

• Spoon (for potato layers and filling)
• Cold water
• Clean white cloths or paper towels
• Cornflour (one round for mayonnaise and oil fat)
• Enzyme carpet cleaner (protease and amylase enzyme)
• Dish soap (one teaspoon per 250ml cold water)
• Hydrogen peroxide 3% (one to two rounds for ají amarillo and potato carotenoid colour)
• Baking soda (overnight, optional — causa is a cold dish with mild aroma)

Step 1: Remove Potato Layers and Filling

Collect the causa potato layers with a spoon — the mashed potato is dense and cohesive and can be collected fairly completely. The vivid yellow-orange colour of the potato layer (from the combined papa amarilla carotenoids and ají amarillo capsanthin) is immediately striking. Collect the tuna or chicken mayonnaise filling. Collect any sliced olive, boiled egg, or avocado accompaniments. Causa is served cold, so there is no hot liquid spreading — the stain is concentrated at the impact zone.

Step 2: Blot the Potato-Ají Layer and Mayonnaise

Blot from the outer edge inward. The mashed potato layer leaves a dense, vivid yellow-orange paste at the contact zone — the colour is striking even in small amounts. The mayonnaise filling transfers as an off-white creamy oil emulsion alongside the potato. Apply cold water and blot twice more. Because causa is served cold and the potato has been mashed with oil rather than cooked in oil, it does not have the oil-spreading characteristics of a hot oily dish — the fat zone is more contained.

Step 3: Apply Cornflour for Mayonnaise and Oil Fat

Apply cornflour, allow 15 minutes, vacuum. One round is standard for causa rellena — the fat content comes from the vegetable oil mixed into the potato mash and the mayonnaise in the filling. Mayonnaise is an oil-in-water emulsion (approximately 70–80% oil), so it contributes a moderate fat load at the filling contact zone. The causa potato layer itself contains a moderate amount of added vegetable oil. One cornflour round addresses both. If the causa was particularly generously dressed with oil or if extra mayonnaise was used, extend to a second round.

Step 4: Apply Enzyme Cleaner for Tuna or Chicken Protein

Apply cold water and blot. Apply enzyme carpet cleaner and allow 20 minutes. The primary protein in the causa filling is either tuna protein (from canned tuna — typically skipjack or yellowfin tuna in brine or spring water) or shredded cooked chicken protein. Both are fish/poultry muscle proteins that respond well to protease enzyme. The egg in the mayonnaise also contributes egg white protein. If a boiled egg slice was present in the filling, the egg white responds to protease and the yolk fat is addressed in the cornflour step. The potato starch from the papa amarilla layer responds to amylase. Follow with dish soap and rinse.

Step 5: Treat Ají Amarillo and Papa Amarilla Colour (One to Two Rounds)

Apply hydrogen peroxide 3%, allow 10 minutes, blot and rinse. The vivid yellow-orange colour of causa rellena comes from two carotenoid sources: (1) Papa amarilla carotenoids — the naturally yellow-fleshed Peruvian potato contains beta-carotene and lutein, giving it a more vivid yellow than European white potato varieties. (2) Ají amarillo capsanthin — the ají amarillo pepper contains capsanthin (a xanthophyll carotenoid responsible for the orange-red colour of chili peppers). In ají amarillo, the capsanthin is expressed as an orange-yellow. Combined, the papa amarilla and ají amarillo create the characteristic vivid golden-yellow-orange of causa that persists as a stain. One peroxide round is usually sufficient for a standard causa spill; apply a second round after full drying if the yellow-orange colour persists visibly. If black olive was present, the olive-derived anthocyanin may leave a faint purple-black mark — also addressed in the same peroxide round.

Step 6: Aroma Treatment — Mild for a Cold Dish

Causa rellena is one of the most aroma-mild dishes covered in this guide — it is served cold, meaning volatile aromatic compounds have not been activated by heat. The lime juice is highly volatile and evaporates quickly. The ají amarillo paste contributes mild capsaicin heat but relatively little persistent aroma on carpet. If tuna filling was used, a mild tuna/fish aroma (from tuna trimethylamine) may be detectable. One overnight baking soda application is usually sufficient or optional. If the causa contained avocado, the avocado contributes no significant aroma on carpet. For a chicken filling version, there is essentially no aroma challenge requiring overnight treatment.