Put a pan of salted water on to start boiling.
Meanwhile peel, wash and cube your potatoes, swede, parsnips and carrots.
Place the vegetable cubes carefully into the boiling water.
Boil for 10-12 minutes until the cubes are cooked through and tender. You can use a fork to test by pressing into one of the cubes and seeing if it begins to break apart.
Mash your root vegetable cubes until they've reached your desired consistency. I LOVE to use a Masha. It is basically a potato masher with a difference. All you need to do is press a button and it runs it through little grooves to get fine mash. It's really changed my mash 'game' and made it much easier for me to make smooth mash every time. It is also fantastic for use making sauces too.
Add in the milk and butter, stir through and add salt and pepper to taste.
You can add a pinch of nutmeg if you want to really bring out some extra flavour in this creamy vegetable mash.
Serve with your favourite meals and enjoy.
Note: If you don't have a potato masher then you could use a food processor, but make sure to pulse and not to over work it or it'll go stringy and won't be as nice.