For two people, I use the following. Easy to upscale. Play with chilli amounts if spicy is your thing.
Tilapia fillets or other firm white fish ( two fillets, weighing about 250g in total). Cubed
2 garlic cloves, chopped
pinch black pepper
2 teaspoons fresh coriander. Chopped
1/4 habanero chilli pepper, seeded and chopped (or real Peruvian Aji Amarillo, if you can find it, or any fresh red chilli)
4-5 limes, freshly squeezed and strained to remove pulp, enough to barely cover the fish
1/4 red onion, thinly sliced and rinsed
1. Combine all ingredients except red onion and mix well.
2. Place red onion on top and let it marinate in the refrigerator for at least 2-3 hours before serving.
Mix well and serve with one or two of the following ~
avocado slices (my favourite!), sweet potato slices, lettuce, corn, sliced radishes, extra coriander or other cold salad vegetables on the side, or even Doritos/popcorn.