Salsa Criolla: Peru's Sharp Onion Relish Explained

The texture is what makes salsa criolla distinctive. The onion is sliced paper-thin, soaked briefly in cold salted water to remove sharpness, then dressed in lime and fresh ají. The result is bright, crunchy, and acidic - almost like a very light ceviche of onion.

Ingredients (serves 4)

• 2 medium red onions
• 1-2 ají amarillo (fresh or from jar), finely sliced - or substitute 1/2 tsp ají amarillo paste
• 3 tbsp fresh lime juice
• 2 tbsp fresh cilantro, roughly chopped
• 1 tbsp olive oil (optional)
• 1/2 tsp salt

Instructions

1. Halve the onions through the root and slice paper-thin, lengthways along the grain. Use a mandoline if you have one - the thinner the better.
2. Place sliced onion in a bowl of cold salted water. Let soak for 10 minutes. This pulls out the harsh compounds and mellows the flavor significantly.
3. Drain and rinse the onion under cold water. Shake off excess water and pat dry with paper towels.
4. Slice the ají amarillo into thin rounds, removing seeds if you want less heat.
5. Combine onion, ají, lime juice, and cilantro. Season with salt.
6. Add olive oil if using - it rounds out the acidity slightly.
7. Toss and taste. It should be sharp and bright. If it's too aggressive, add a pinch of sugar.
8. Rest for five minutes before serving. The onion will continue to soften slightly in the lime juice.

What Goes Well With Salsa Criolla

The obvious pairing is lomo saltado - the stir-fried beef and potato dish where the criolla's acid cuts through the rich sauce. But it works just as well on grilled chicken, fish tacos, rice and beans, or alongside a plate of baked salmon. In Peru it's used as a topping for anticuchos (grilled beef heart skewers) and on ceviche alongside leche de tigre.

One underused application: spoon salsa criolla over scrambled eggs in the morning. The acid wakes the whole plate up.

Nutrition (per 1/4 cup serving)

• Calories: ~20 kcal (without oil), ~35 kcal (with oil)
• Protein: 0g
• Carbs: 4g
• Fat: 0-2g

Storage

Keeps in the fridge for up to 2 days. After that the onion softens too much and the cilantro turns. Make small batches and use quickly. The lime-soaked onion is the component with the shortest life - the ají and cilantro hold better.

Variations

Some versions add finely sliced tomato, which makes it closer to a pico de gallo. Others include finely sliced cucumber for a colder, more refreshing result in summer. The ají can be swapped for thinly sliced green jalapeño if ají amarillo is unavailable - the flavor changes but the function is the same.

Meal Prep Tips

Pre-slice and soak the onion up to a day ahead, then store dried and undressed in the fridge. Dress with lime and ají 15 minutes before serving. This halves the prep time on the day. For more quick Peruvian condiments and a broader guide to South American cooking, visit our complete condiment guide.