Ingredients
- Heat the butter in a saucepan
- Add the finely chopped onion and cook for 5 minutes until softened
- Stir in the flour, and cook for 2 minutes
- Slowly whisk in the milk
- Once all is incorporated, gently cook for 5 minutes until the sauce has thickened
- Meanwhile, place the spinach in a large colander
- Pour a kettle of boiling water over the spinach, until the leaves have wilted
- You may need to do this twice
- Place the spinach in a clean dishcloth and squeeze out any excess liquid
- Chop finely
- Stir into the sauce with the single cream, gently heat
- Finely grate some fresh nutmeg and season well
