How to make Ceviche? recipe !!

Cooking with lorena kichik Shooting my ceviche recipe yummy 😋 ingredients 1. ½ a red onion, very thinly sliced 2. 1 pound fresh shrimp diced into 1/2 inch cubes. 3. 2–3 garlic cloves very finely minced ( use a garlic press) 4. 1– 1 ½ teaspoon kosher salt, start with 1, add more to taste 5. ¼ teaspoon black pepper 6. ¼–½  cup fresh cilantro chopped 7. 1 fresh serrano or jalapeño chili pepper seeded and very finely chopped. Start conservatively, more to taste. 8. ¾ cup fresh lime juice ( 4–6 limes) freshly squeezed ( try to use ripe limes) 9. 1 cup grape or cherry tomatoes, cut in half  ( or 1 cup diced tomatoes) 10. 1 cup diced cucumber 11. 1 tablespoon olive oil (optional) 12. 1 semi-firm Avocado, diced, as garnish, optional