6medium potatoes, peeled and cut into large chunks
200gramsfrozen peas
4tablespoonsbutter (plus extra for serving)
Salt and black pepper, to taste
1/2cupReserved potato cooking water or ½ cup warm milk
Optional: fresh parsley or chives, to finish
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Instructions
Cook the potatoes
Place the peeled and chopped potatoes in a large pot. Cover with cold water, add a generous pinch of salt, and bring to a boil. Reduce to a simmer and cook until very tender, about 15–20 minutes.
Add the peas
Add the frozen peas directly to the pot during the last minute of cooking. They only need a brief cook to stay bright and sweet.
Drain (and reserve liquid)
Drain the potatoes and peas, reserving some of the potato cooking water.
Mash while hot
Add the butter, a pinch of salt, and a small splash of reserved water (or warm milk). Mash while everything is still hot and steamy until creamy but not gluey.
Rest and finish
Cover with a lid and let the mash sit for a few minutes before serving. Finish with extra butter, freshly cracked black pepper, and herbs if using.
Notes
Adjust seasoning and texture to taste — this recipe is flexible.
Mash while hot and add liquid gradually for best results.
Leftovers keep well in the fridge for up to 3 days.
Reheat gently with a splash of milk, stock, or water.