Chop the broccoli into small pieces and dice the onion into 1cm cubes.

Place broccoli and onion in a microwave-safe container, cover loosely with plastic wrap, and microwave at 600W for 2 minutes.

In a bowl, crack the eggs and mix with grated cheese, salt, and pepper. Add shirasu and the cooled broccoli-onion mixture, then combine well.

Heat olive oil in a frying pan, pour in the egg mixture, and stir gently until semi-cooked.