Cut the avocado in half.
With the sharp edge of the knife (like an axe), lightly cut into the pit of the avocado and turn the knife to remove the pit easily.
Hold the avocado half with the peel in a handful, and use a knife to score the flesh as if slicing. Try to press the knife just enough to reach the peel.
Scoop out the avocado with a spoon. If the avocado is large, dig in half. This will give you a nicely diced avocado.
Add the scallions. Season with salt and pepper, mix lightly but do not mash.
Cook the avocado just before serving.