Toast the bread to your liking. Meanwhile, use a wide spoon to remove the avocado halves from the peel, keeping them in large pieces.
Drizzle the hot toast lightly with olive oil and sprinkle with salt. Let cool slightly, then place one avocado half on each slice of toast. Use the back of a fork to roughly mash the avocado into the bread, keeping it as chunky as possible.
Sprinkle with a little more salt, and pepper if desired. Squeeze the citrus over the top and add any garnishes. Cut each piece of toast in half if they're large and serve immediately.