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How to Make Puréed & Mashed Potatoes With Thomas Keller

How to Make Puréed & Mashed Potatoes With Thomas Keller

Learn the ideal uses for different varieties of potato from Chef Thomas Keller.

Red Bliss potatoes, a waxy variety, have high moisture and sugar content. When roasted or fried, they brown very quickly but do not become crisp. They may be gummy when mashed and are instead best for boiling and steaming.

The Russet potato was originally hybridized in the 1870s and exploded into popularity in post-WWII America with the advent of fast-food and frozen french fries. Russets now account for 70 percent of potato sales in the United States. Russets are considered a “floury” potato with large starch granules; therefore, they are not ideal for mashing, as they will have a coarse texture. They are best for baking and frying.

Yukon Gold potatoes are a “jack of all trades” potato. They are suitable for frying, baking, puréeing, and boiling, but they may not be the best in each cooking method. Yukon Gold potatoes were developed in Canada in the 1960s, as a hybrid of ancient Peruvian golden potato varieties. Thanks to their fine texture, dry interior, and good flavor, they quickly found favor in the chef community when they became commercially available.

There are many varieties of fingerling potatoes you may encounter at your local market. Each may have different characteristics. We have highlighted the La Ratte fingerling potatoes as being the best potato to make pommes purée from. Their dry, finely textured flesh will produce the smoothest and most refined potato purée and will allow for the most fat to be incorporated.

Potato Recipes

Mashed Potatoes Versus Potato Purée

Creamy mashed potatoes are a classic American side dish, typically made by peeling the potatoes, dicing them, boiling them, and then mashing them while they cook in a pot. Perhaps you have memories of your mother using a potato masher to make this rustic dish, or perhaps a potato ricer to make it more refined. The French elevate this side dish by puréeing potatoes. For this dish, you leave the skins on the potatoes and cook them whole in order to prevent them from absorbing too much water, which in turn allows them to take on richer flavor from the cream and butter, making them more luxurious than even the best mashed potatoes. Patience is a must, as it takes time to properly incorporate the fat into the potatoes. Chef Keller shows you how to make this refined dish.

How to Make Potato Purée

Making a French potato purée starts with the right kind of potato. The best potato for this purée is the La Ratte fingerling, a dense French varietal that is renowned for its ability to absorb large quantities of cream and butter. Yukon Gold potatoes are a great substitute and are much more readily available in America.

Ingredients
190 grams cream, hot
225 grams cold butter, cubed
50 grams clarified butter (optional)
750 grams Yukon Gold potatoes
Warm water as needed
Kosher salt
Unsalted butter for finishing
Maldon salt for finishing

Equipment
Cutting board
Paring knife
3-quart saucepot
Slotted spoon
Tamis, finest mesh
Parchment
Bowl scraper
4-quart copper core saucepan
Stiff rubber spatula
Serving bowl

Place the whole, unpeeled potatoes in a 3-quart saucepot and cover by 2 inches with cold water, slowly bring the water to a gentle simmer. Starting them in cold water prevents the skins from breaking. Cook the potatoes until they are extremely tender when tested with a paring knife. When ready, turn off the heat.

Working one potato at a time, remove from the water, place on the tamis, split the potato in half, and press the flesh through the screen using a stiff bowl scraper, while leaving the skins behind. It is a good idea to place a sheet of parchment paper underneath to collect the passed pulp.

Once all of the potatoes have been passed, transfer them to a 4-quart saucepan. Warm the saucepan over medium-low heat, use a stiff rubber spatula to incorporate ⅓ of the hot cream into the potatoes, and beat in a few cubes of butter with the rubber spatula until the butter is emulsified into the potatoes. Drizzle in a little clarified butter. Clarified butter adds a more intense butter flavor than whole butter. Keep adding the cream, butter, and clarified butter to develop a creamy purée. The ideal pommes purée should have a milky, creamy appearance. If the purée begins to look oily with the fat separating from the potatoes, the emulsion is breaking. To restore the emulsion, you may need to add hot water periodically, just as you would for mayonnaise or hollandaise. Additionally, regulate the heat to allow the butter to be incorporated without losing the emulsion.

Once you’ve achieved your desired texture, season with salt, transfer to a serving bowl, and top with a pad of butter.

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