Zesty Lime Shrimp and Avocado Salad

Instructions
Prepare the Dressing:

In a small bowl, combine the chopped red onion, lime juice, olive oil, kosher salt, and a generous amount of black pepper.
Stir the ingredients vigorously until they are fully mixed.
Let the mixture sit for a few minutes to allow the flavors to blend.
Combine the Main Ingredients:

In a large mixing bowl, add the chopped shrimp, diced tomato, diced avocado, finely diced jalapeño, and chopped cilantro.
Gently toss to combine, being careful not to mash the avocado.