Preparing the tuna: Place the tuna cubes in a bowl.
Mixing the ingredients: In the bowl with the tuna, add the avocado, lime juice, coriander, red onion and olive oil. Season with salt and pepper to taste. Mix gently to coat the tuna with all the ingredients.
Serving: Serve the tuna tartare very fresh, accompanied by tortilla chips for a crunchy texture. You can also present it with a tomato salad for a touch of freshness.