Authentic Mexican Shrimp Cocktail (Coctel de Camarones estilo Mexicano)

⅓ cup Spanish onion

chopped

¼ cup freshly squeezed lime juice

1 pound chilled cooked medium shrimp - peeled

deveined

andtails removed

2 roma (plum) tomatoes

chopped

1 cucumber

finely chopped

1 stalk celery

finely chopped

1 jalapeno pepper

seeded and finely chopped

2 teaspoons salt

2 teaspoons ground black pepper

1 ½ cups chilled tomato and clam juice cocktail (such as Clamato®)

1 cup chilled ketchup (such as Heinz®)

1 bunch fresh cilantro - stems discarded and leaves chopped

2 tablespoons hot pepper sauce (such as Valentina®)

2 avocados - peeled

pitted

and chopped