I have not tried this recipe yet but I make a very similar guacamole. My friend swore this tasted identical, but with shrimp mixed in, so I trust her on this one.
1 lb. jumbo cooked shrimp, peeled, deveined, and chopped
1 medium tomato, diced
1 avocado, diced
1 jalapeno, seeds removed, diced
1/4 cup diced red onion
juice of two limes
1 tsp. olive oil
1 Tbsp. chopped cilantro
salt and pepper to taste
In a small bowl combine red onion, lime juice, olive oil, and pinch of salt and pepper. Let them marinate for at least 5 minutes.
In a large bowl combine shrimp, avocado, tomato, and jalapeno. Add the marinade and cilantro and gently toss. Add salt and pepper to taste.
On a side note, this is almost identical to my guacamole recipe. As an added flavor (and health) bonus, in my guacamole I often chop up a mango and toss it in.