Cut avocado in half and peel off the skin. Lay one half of the avocado, cut side down, and slice the avocado thinly. You want the slices to be quite thin so that they're easier to shape. If you want a smaller rose, you'll only want to use 1/2 of the slices. Use all the slices if you want a large flower.
Fan out avocado slices so that they form a long line with the slices overlapping each other. I usually remove the small slices from the ends because they are difficult to shape. Starting from one end, curl avocado slices toward the center. Continue curling the avocado slices until you get a rose.
Serve avocado rose on toast with a fried egg, if desired. Sprinkle on your favorite spices, such as za'atar, to garnish.