Peel and cube 1kg Maris Piper potatoes.
Add to cold salted water, bring to the boil, then simmer gently until completely tender.
Drain and leave to steam dry for 20-30 minutes.
Gently simmer 200ml whole milk and 200ml double cream with 4 chopped garlic cloves and 3-4 thyme sprigs for 30 minutes to infuse.
Strain and keep warm.
Pass the dried potatoes through a ricer, then fold through 150g melted butter.
For extra smoothness, push through a fine mesh sieve.
Add the warm infused cream one ladle at a time until silky and smooth but still holding its shape.
Season with fine salt, white pepper and a small grating of nutmeg.
Taste and adjust.
