But we’re not wasteful here at Milk Street.
Our Milk-Simmered Mashed Potatoes capitalize on the potato’s natural gifts. Instead of extracting the starch in boiling water, only to dump it down the drain, we simmer Yukon Golds in a couple cups of milk, allowing them to absorb the dairy’s flavor while retaining their starch.
According to “Starch: Chemistry and Technology,” edited by Roy L. Whistler, James N. Bemiller and Eugene F. Paschall, root and tuber starches “generally have large granules and cook and solubilize more readily than grain starches.” When cooked, the granules swell, imparting “extra high viscosity.” Simply put: As long as you don’t wash those granules down the drain, you won’t have to compensate with thick, heavy cream.
But those same starches are what makes potatoes so easy to over-process. Release too much starch with vigorous or prolonged mashing, and your spuds become too viscous, giving the mash a gluey texture. To ensure you get the perfect creamy-smooth texture, we use Yukon Golds, which are dense and lower in starch than russets. We tested the technique with russets but found their texture too mealy.
Just simmer the spuds in milk over low heat until they start to fall apart and most of the liquid has been absorbed, then remove from the heat and mash with butter. Taste, season with salt and pepper as desired, and serve immediately.
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