There are many different versions of ceviche. Ceviche de Camarón is a shrimp variation and is made from combining lime juice, red onions, scallions, red pepper and coconut milk. It’s often served with some saltine crackers making a very tasty snack.
The only ingredient with enough calories worth tracking is the fish. Feel free to use more or less of the other ingredients.
I would recommend having fish 2-3 times per week.