Potato Gratin with Rosemary and Piave Cheese

Had three pounds of potatoes and a jar of good cream. Wanted something that didn’t feel like a weeknight thing. This potato dauphinoise showed up instead — the kind that sits in your fridge overnight getting denser, crunchier on the outside, creamy in the middle. Takes time. Worth it.

This is potatoes au gratin done the slow way. Not the fast way. The way where you bake it, press it, chill it overnight, then pan-fry it until the edges shatter. It’s a side dish that doesn’t apologize. It takes 3 hours and 25 minutes total, but most of that is waiting. Your oven does the work. Then your fridge does the work. Then you get to eat something that tastes like you spent the whole day on it.

Why You’ll Love This

Takes actual time but barely any of it is active work. Prep the potatoes. Make the cream. Walk away. Refrigerate overnight. Pan-fry the next day. That’s it.

Tastes like a restaurant brought you something. Crispy crust. Creamy inside. Rosemary in every bite. This is comfort food that doesn’t feel like you made it at home.

Works as a side for literally anything. Steak. Roasted chicken. Even just by itself with a salad if you’re being honest.

Vegetarian without feeling like it. Aged Piave cheese does the heavy lifting. The lemon zest keeps it from being heavy.

The Cream, the Garlic, the Foundation

Start with 400 ml of cream — 18% or 30% fat. Doesn’t really matter which. Heat it with 4 garlic cloves, halved. Bring it to a boil. Then turn it down. Simmer 6 minutes on low. The garlic softens completely. The cream gets smooth and just slightly thinner from the heat.

Pull out the garlic. Zest 1 lemon right into the cream. Not much zest. Just the bright part. Add 50 grams of grated aged Piave cheese — or any hard vegetarian cheese that melts cleanly. Stir it. The cheese breaks up and gets absorbed into the cream like it was always supposed to be there.

Salt it. Pepper it. Taste it. It should taste like something you’d want to eat on its own.

Layering the Potatoes and the Long Bake

Peel 2 kg of Yukon Gold or white potatoes. Slice them thin. Like 4 mm thin. Use a mandoline if you have one. If not, a sharp knife and patience. Thinner potatoes mean they actually cook through.

Throw the slices into a large bowl. Pour the cream through a fine sieve over the potatoes. The sieve catches any bits. Mix gently. The potatoes need to be coated but not broken up.

Line a 20x20 cm square pan with parchment. Hang excess over two opposite sides — you’ll need it to fold over the top. Layer the potatoes in overlapping rows. Like shingles on a roof. Pour whatever cream is left in the bowl on top.

Cover it tightly with a parchment square, then foil on top of that. The parchment goes first so the cream doesn’t touch the foil directly. Bake at 185°C (365°F) for 1 hour and 35 minutes. Don’t check it. Just let it sit.

Pressing the Gratin Overnight

Pull it out when the potatoes are tender all the way through. Let it cool for 15 minutes. Just enough so you won’t burn yourself.

Place a second pan the same size on top. Keep the parchment and foil in place. Put something heavy on top — a brick, some canned goods, whatever weighs about 5 pounds. Put it in the fridge. Leave it there 7 to 9 hours. Or overnight. The weight compacts the potatoes. The cream solidifies. It becomes one dense, cohesive thing.

Slicing and Crisping

Take off the parchment and foil. Trim the edges if they look ragged. Cut the whole thing in half. Then cut each half into six rectangles. That’s 12 pieces total. You can freeze them here if you want. They’ll keep for a month. They won’t. You’ll cook them.

Heat a large nonstick skillet on medium-high. Add 40 ml of avocado oil and 3 fresh rosemary sprigs. The oil gets hot. The rosemary smells like nothing until the oil hits it, then it smells like everything.

Brown 6 gratin pieces in the oil on all sides. Turn carefully. They’re fragile until the outside sets. It takes a few minutes. You’ll see the edges turn golden. That’s when you know it’s working.

Transfer the browned pieces to a baking sheet lined with parchment or a silicone mat. Bake them at 205°C (400°F) for 7 to 9 minutes. They come out with a crispy crust all around and hot cream inside.

Wipe out the pan. Add the remaining oil and 3 more rosemary sprigs. Brown the other 6 pieces the same way. Finish them in the oven the same way. The whole thing takes maybe 20 minutes from cold gratin to crispy gratin.

Timing, Temperature, and the Common Mistakes

The worst mistake is rushing the bake. If your potatoes aren’t actually tender after 1 hour and 35 minutes, bake them longer. An extra 15 minutes won’t hurt. Undercooked potatoes will be gritty. Nobody wants that.

The second worst is not pressing hard enough. The weight matters. It’s what turns a creamy baked dish into something that slices cleanly and has a crust.

Temperature control on the pan-fry is the thing. Medium-high means the oil shimmers. Not smoking. You want a brown crust, not charred potatoes. If they’re browning too fast, lower the heat. If they’re taking forever, raise it. Every stove is different.

The rosemary in the oil matters more than it seems. It infuses as it heats. Don’t skip it. Don’t use dried rosemary either. Fresh only. Dried tastes like dust.

Potato Gratin with Rosemary and Piave Cheese

By Emma

Prep:

45 min

Cook:

2h 40min

Total:

3h 25min

Servings:

12

Ingredients

• 400 ml cooking cream 18% or 30%
• 4 garlic cloves, halved
• 2 kg Yukon Gold or white potatoes, peeled and thinly sliced 4 mm
• 80 ml avocado oil
• 6 sprigs rosemary fresh
• Zest of 1 lemon
• 50 g grated aged Piave cheese (or vegetarian hard cheese)
• Salt and pepper

Method

1. 1 Set oven rack middle position. Preheat to 185 C (365 F). Line 20x20 cm square pan with parchment, allowing excess to hang over opposite sides.
2. 2 Heat cream with garlic halves in saucepan. Bring to boil, then simmer 6 minutes on low. Add salt and pepper.
3. 3 Discard garlic. Zest the lemon. Combine zest and grated Piave cheese into cream, stir well.
4. 4 Place thin potato slices in large bowl. Pour cream mixture through fine sieve over potatoes. Mix gently to coat evenly.
5. 5 Arrange potatoes in overlapping layers in pan. Pour any remaining cream on top.
6. 6 Cover potatoes tightly with parchment square, then foil on top. Bake 1 hour 35 minutes until tender throughout.
7. 7 Remove from oven. Let cool slightly for 15 minutes.
8. 8 Place a second pan same size on top, keeping parchment and foil in place. Add a heavy weight (canned goods). Refrigerate 7-9 hours or overnight to compact.
9. 9 Take off parchment and foil. Trim edges evenly if needed. Slice in half, then each half into six rectangles. Freeze here if needed.
10. 10 Preheat oven to 205 C (400 F). Line baking sheet with silicone mat or parchment.
11. 11 Heat large nonstick skillet on medium-high. Add half avocado oil and rosemary sprigs. Brown six gratin pieces in oil on all sides, turning carefully.
12. 12 Transfer browned pieces to baking sheet. Bake 7-9 minutes until hot inside and crispy all over.
13. 13 Repeat pan fry with remainder oil and gratins. Finish on sheet in oven same way.

Nutritional information

Calories

280

Protein

5g

Carbs

25g

Fat

17g

Print Recipe Save to Pinterest

Frequently Asked Questions

Can I make this dauphinoise ahead of time? Yes. This is basically designed for that. Bake it, press it overnight, cut it, then pan-fry the next day. Or freeze the cut pieces after pressing. They keep for a month. Just add 2-3 minutes to the pan-fry time if they’re coming straight from the freezer.

Do I have to use Piave cheese? Any aged hard cheese works. Pecorino Romano is sharper. Gruyère is creamier. Parmigiano-Reggiano is classic. They’re all fine. Just use something that melts and has flavor. Fresh mozzarella won’t work here.

What’s the difference between this and regular scalloped potatoes? This is potatoes au gratin that gets pressed and pan-fried after baking. Regular scalloped potatoes stay soft throughout. This one gets a crust. The pressing step makes it dense enough to slice and fry. That’s the whole thing.

Can I skip the lemon zest? Skip it and the dish gets heavy pretty fast. The zest doesn’t taste like lemon — it just keeps everything from feeling too rich. If you hate lemon, use lime or orange zest instead. Or just skip it. It’ll still be good.

What if my gratin falls apart when I brown it? It means it didn’t get pressed long enough or hard enough. Leave it in the fridge longer next time. Or add more weight. Also, use avocado oil, not butter or olive oil. Butter burns. Olive oil smokes. Avocado oil stays calm and lets you get a good sear without heat drama.

How many people does this feed? Twelve pieces. So probably 4-6 people as a side. Maybe 3 if it’s the main event and everyone loves potatoes. But honestly, one person can eat four of these and nobody will stop them.