Wash and pat dry the shrimp. Drizzle with olive oil, lime juice, salt, pepper and red pepper flakes. Make sure to evenly coat all sides.
Preheat grill to 400 degrees. Make the dressing by combining ingredients in a bowl. Season to taste.
Add shrimp to the grill and cook for about 3 min per side or until shrimp are browned and cooked through.
Wash bibb lettuce and add to a plate. Cube mango and avocado and add to lettuce along with pepitas and pickled shallots. Pour dressing over and toss. Arrange shrimp on top. Enjoy!