The potatoes start to hiss as soon as they hit the hot duck fat, and the smell is a pretty good sign that the oven is doing its job. The tricky part comes earlier: potatoes that go straight into the oven often brown before their centers turn tender. For these crispy duck fat roasted potatoes with rosemary, a short simmer gets the insides cooking before the hot pan builds a deeply golden crust.
I like Yukon Golds here because they hold their shape through boiling and still have enough starch on the outside to turn rough when you shake them in the pot. Those craggy edges catch the duck fat and crisp as they roast. Fresh rosemary goes on near the end, so the leaves perfume the potatoes without spending the whole time in the oven.
Kitchen Note
Add the rosemary for only the final 10 minutes. It gives the potatoes a fresh, fragrant finish without letting the delicate leaves scorch during the longer roast.
Save these crispy duck fat roasted potatoes with rosemary for a golden, crackly-edged side with tender centers and a fresh rosemary finish.
Why the Potatoes Need a Rough Edge Before They Roast
A smooth, freshly cut potato has less surface area to brown. Simmering the chunks first softens the outside, and a quick shake in the pot scuffs that softened layer into a thin, uneven coating. In the oven, those little ridges meet the hot duck fat directly and turn crisp while the middle finishes cooking.
It’s a small bit of handling that changes the texture more than an extra stretch in the oven would. The goal isn’t to mash the potatoes or break them into pieces; you want their corners to look slightly fuzzy while each chunk stays intact. If you skip the shake, the potatoes will still roast, but their edges won’t have the same brittle, craggy crunch.
Drying matters for a different reason. Water clinging to the drained potatoes can steam against the hot fat instead of letting the surfaces roast cleanly. Give them the full steam-dry rest, then coat them carefully and spread them out so every piece has room to brown.
What Yukon Golds and Duck Fat Bring to the Pan
- Yukon Gold potatoes — Their creamy centers and sturdy shape suit the boil-then-roast method. Choose firm potatoes without soft spots; the inexpensive bag is fine as long as the potatoes are fresh and similar in size. Cutting them into even chunks helps them reach the same tenderness during the simmer.
- Duck fat — This is the defining savory note, not just a way to keep the potatoes from sticking. Rendered duck fat coats the rough potato surfaces and gives the crust a rich, roasted taste. A clean, well-stored fat is worth using; any off smell is a reason to discard it. For a vegetarian adaptation, the variation below explains the trade-off when using refined olive oil instead.
- Fresh rosemary — Finely chopped leaves distribute more evenly than whole sprigs, so each serving gets a little herbal fragrance. Fresh rosemary has a brighter character than dried, and dried leaves aren’t a one-for-one stand-in for the texture and finish here.
- Black pepper — Freshly ground pepper gives the potatoes a warm, sharp contrast to the rich fat. Pre-ground pepper works if that’s what you have; it just tends to taste less lively.
From a Brisk Simmer to a Deeply Golden Crust
Heat the Duck Fat While the Oven Preheats
Set the oven to 425°F and put the duck fat on an 18×13-inch rimmed baking sheet. Heat the pan in the oven for 5 minutes, until the fat is melted and hot, while you bring the potatoes and water to a boil in a 6-quart pot. The hot fat should be ready when the potatoes are drained, so don’t leave it sitting out to cool. Handle the pan carefully when it comes out; the fat is hot.
Simmer Until the Centers Still Resist
Bring the potatoes and water to a boil over high heat, then lower the heat to keep a brisk simmer. Cook for 8–10 minutes, checking a chunk with a knife near the end of that window. The outside should be tender, but the center should still offer slight resistance. If the pieces are falling apart, they’ve gone too far for the shaking step that follows.
Roughen, Dry, and Coat the Chunks
Drain the potatoes well and return them to the pot. Shake the pot just enough to scuff the surfaces and corners, keeping the chunks mostly whole, then let them steam dry for 5 minutes. Toss them with the kosher salt and black pepper. Carefully add them to the hot duck fat, turn to coat, and spread them in a single layer across the sheet.
Turn for Even Browning, Then Add Rosemary
Roast for 40–50 minutes, turning the potatoes every 20 minutes. Each turn lets another side meet the hot pan, so look for a deep golden color and crisp edges rather than relying on one browned face. Scatter the finely chopped rosemary over the potatoes for the final 10 minutes. Take the pan out when the potatoes are deeply golden and crisp.
Simple Changes That Keep the Potatoes Worth Making
A Vegetarian Version with Refined Olive Oil
Replace the duck fat with 1/3 cup refined olive oil for a vegetarian version. The potatoes will still roast and crisp, but you’ll lose duck fat’s distinct savory richness, so the result tastes cleaner and more neutral.
Leave Out the Rosemary
Skip the rosemary for a simpler duck-fat potato with the same crisp edges and peppery seasoning. This is a good choice when you want the potato and duck fat to be the main flavors, with no change to the cooking method.
Make Them Without Black Pepper
Omit the black pepper for a gentler, more straightforward seasoning. The salt, duck fat, and rosemary still give the potatoes plenty of character, and this small change keeps the recipe’s texture intact.
Storage and Reheating
- Refrigerator: Cool and refrigerate leftovers within 2 hours; store them in an airtight container for up to 4 days. The crust softens in the refrigerator.
- Freezer: Freezing isn’t recommended. Cooked Yukon Gold potatoes tend to turn mealy after thawing, and the crisp edges won’t return as well.
- Reheating: Spread the potatoes on a baking sheet and warm them in a 425°F oven until hot and crisp again. The microwave is quicker, but it softens the edges rather than restoring them.
Questions About Getting These Potatoes Right
Crispy Duck Fat Roasted Potatoes with Rosemary
Ingredients
Equipment
Method
- Place the potatoes and water in a 6-quart pot and bring to a boil over high heat.
- While the water comes to a boil, preheat the oven to 425°F.
- Put the duck fat on an 18x13-inch rimmed baking sheet and heat it in the oven for 5 minutes, until melted and hot.
- Reduce the heat to maintain a brisk simmer and cook the potatoes for 8–10 minutes, until the outsides are tender but the centers still offer slight resistance when pierced with a knife.
- Drain the potatoes well and return them to the pot.
- Shake the pot to roughen the potatoes’ edges, then let them steam dry for 5 minutes.
- Toss the potatoes with the salt and pepper, then carefully add them to the hot duck fat and turn to coat.
- Spread the potatoes in a single layer.
- Roast for 40–50 minutes, turning the potatoes every 20 minutes, until deeply golden and crisp.
- Scatter the rosemary over the potatoes for the final 10 minutes of roasting.
