← All Recipes
Recipe by James John Deren

Sweet Potato & Turnip Mash with Sage Butter

This is the dish that makes every mashed potato fan figure out what they’ve been missing all their life!

Prep Time 5 mins
Cook Time 35 mins
Servings 4 - 6 servings
Category Side Dish

Ingredients

  • 1½ lb Sweet Potatoes, peeled and cubed large
  • ¾ lb Turnips, peeled and cubed medium
  • 2-3 Garlic Cloves, roughly chopped
  • 8-10 Sage Leaves
  • 1 T Salt
  • ¼ C Light Cream, or more to taste
  • 1 C Milk, warmed
  • Kosher Salt
  • Freshly Cracked Black Pepper
  • ¾ Stick of Butter, unsalted
  • 8-10 Sage Leaves, unfurled flat
  • ½ C Olive Oil, with more reserved
  • 1 Shallot, sliced into thin rings, separated
  • Kosher Salt

Instructions

  1. 1 Place The Root Vegetables, Garlic And: Place the root vegetables, garlic and sage in a large pot. Add water to cover by 1 inch. Bring to a boil, add the salt, and reduce to a simmer. When the root vegetables are fork-tender, drain and place back in the pot.
  2. 2 While The Vegetables Are Boiling, Heat: While the vegetables are boiling, heat the vegetable oil in a small pan to 375-400 degrees. Add ¼ of the shallots, and occasionally stir while they fry until golden. Remove to paper toweling to drain and season with salt. Finish the others in 3 more batches, letting the oil return to temperature between batches. Add more oil, if needed.
  3. 3 Melt The Butter Over Medium Heat: Melt the butter over medium heat. When it starts to foam, add the sage leaves. Gently move the leaves around while they fry to a crisp. Once the butter has started to brown, remove the leaves and add the butter to the root vegetables. Reserve the leaves for garnish.
  4. 4 Add The Cream, Then Use A: Add the cream, then use a hand mixer to blend, adding milk as needed, until light and creamy.
  5. 5 Season To Taste: Season to taste.
  6. 6 To Serve, Place The Mash In: To serve, place the mash in a serving bowl, top with about 1 T of the shallots, and arrange a few of the sage leaves decoratively.

Pro Tips & Delicious Variations

  • The turnips take longer to cook, so cube them smaller than the sweet potatoes. Because they are both fibrous, don’t worry if they are a bit over-cooked. They’re very forgiving.
  • If you don’t have light cream, whole milk or 2 tablespoons of heavy cream can be substituted.
  • Strain and save the shallot oil to to make salad dressings or to drizzle over tomato soup and other dishes.
  • You can also use a deep fryer for the shallots.
  • The deep green, golden brown and autumnal orange colors of this presents beautifully in a simple, clean white ceramic dish.
  • Boiling garlic works great in many recipes, including smaller whole cloves in pasta water - after draining, mash and add to the sauce!
← Back to All Recipes
©️ 2026 James John Deren