1. Blanch the spinach in boiling water for 1 minute,then drain well and squeeze out as much liquid as possible.
2. Combine the sliced onion and 2 cups milk in a separate bowl and allow to stand for 30 minutes.
3. Heat the butter in a small saucepan over medium and fry the chopped onion until translucent. Add ¼ cup of flour and stir to combine. Add remaining milk and the cream a little at a time,stirring until a thick sauce forms.
4. Stir through the spinach,nutmeg and parmesan cheese and season to taste. Set aside.
5. Heat your oven to 200°C. Season the steaks well on each side and heat 1 tbsp of the vegetable oil in an ovenproof frying pan until very hot. Sear the steaks until well browned and place them into the oven for just 5 minutes or until cooked to your liking. Rest well.*
6. While the steaks are resting,heat the remaining oil in a small saucepan to 180°C. Remove the onions from the milk and toss them in the flour to coat them. Fry the onions in batches in the oil until well-browned,then remove,drain and season with salt and pepper.
7. Place a big spoonful of the spinach on a warmed plate and place a steak on top. Top with a big pile of crispy onions and serve.