We first had this purée of carrots and parsnips in a hotel in Dublin when I was a child, and it has been called "Dublin vegetables" in our family ever since! If you prefer, you can mash the vegetables instead of blitzing them to a purée - it still tastes fabulous.
- Put the carrots and parsnips into a large saucepan, cover with water, put on the lid, bring to a boil, then simmer until all the vegetables are soft (20-30 minutes, depending on your vegetables and the size you have cut).
- Drain off all the water, and return the vegetables to the hot pan to evaporate off any excess moisture - you don't want the purée to be too wet.
- Add the butter, salt and pepper (to taste), then blitz with a hand blender until you have a purée (it's nice left lumpy, too).
- Serve hot, with extra butter, freshly ground black pepper and a little nutmeg (if liked) ground over the top.