Heat the oil in a large pan. Add the onion and the zucchini and stir-fry until golden brown.
Add the minced beef and break it up into small pieces with a wooden spoon. Brown it for 5 minutes, until it is completely cooked. Salt and pepper to taste.
Turn the heat to low and make four little wells in the beef mixture. Crack an egg into each well. Cover and cook the eggs for 3–5 mi