Make the ultimate mash
• Sweet potatoes can retain more liquid than regular potatoes when boiled, which can result in soggy mash. To prevent this, make sure you leave them to steam dry in a colander for at least 10 mins until the edges look flaky.
• For super-smooth mash, use a potato ricer – this is like a giant garlic crusher for spuds! Alternatively, push them through a fine sieve with the back of a large metal spoon. This is how The Ivy achieves super smooth fluffy mash on its signature shepherd’s pie.
• We’ve used a piping bag with a star nozzle attachment to pipe the mash on the pie. This creates lots of peaks, which become crispy in the oven. You can simply spoon the mash on top if you like, then use a fork to rough it up a little.