Dublin-Style Potato Gratin with Cheddar | Page 2

Prep Time

40 minutes

Cook Time

85 minutes

Total Time

125 minutes

Servings

6 servings

Craving a potato gratin that truly warms you up without requiring three pots and a half-day? This Dublin-style version keeps the generous spirit of the dish, but replaces the beer with a flavorful broth—simpler to handle and rounder on the palate. Cheddar does the heavy lifting: it browns, it melts, it flavors.

Final result — A generous, well-browned gratin with tender potatoes and a real layer of gratinated cheddar.

When it comes out of the oven, the top should be nicely amber, with small bubbles of cream rising along the edges. The spoon cuts through a salty cheddar crust before falling into layers of soft, almost silky potatoes. It smells of warm milk, melted cheese, and reduced broth, with that family-style side that calls for a bright salad alongside.

Why you’ll love this recipe

✓Creamy without heaviness : The milk and broth first cook the potatoes, then the cream is added only at the end. Result: a coating sauce, not a compact block.

✓Plenty of cheddar : We don’t hide it in the preparation: it melts into the cream and gratinates on top. The taste remains bold, salty, slightly nutty.

✓Simpler classic : No need to prepare a separate béchamel. The cooking of the potatoes already releases starch, so the sauce thickens naturally.

✓Great reheated : The gratin holds up better after resting, and the flavors deepen. The top loses some crispness but gains in meltiness.

Ingredient Notes

Potatoes, milk, cream, cheddar, and broth: few ingredients, so a good cheese is essential.

Potatoes : They form the structure of the gratin and release just enough starch to bind the sauce. Choose waxy or all-purpose potatoes like Monalisa, Agata, or Charlotte if you want slices that stay well-defined.
Flavorful vegetable broth : It replaces the deep note of beer without adding alcohol. Use a low-sodium broth if your cheddar is strong, or add a teaspoon of soy sauce for a browner, rounder flavor.
Milk : It tenderizes the potatoes during pre-cooking and provides a gentle base for the sauce. Whole milk is preferable here, but semi-skimmed works if the cream is generous.
Heavy cream : It rounds out the reduced broth and gives that velvety texture that coats the slices. Avoid light cream; it can make the sauce more watery and less shiny.
Cheddar : It brings the salt, golden color, and slightly tangy taste to the gratin. Grate it yourself if possible: pre-shredded bags often melt less well due to anti-caking agents.
Salt and butter : Salt should be adjusted cautiously, as the cheese and broth already provide it. Butter is mainly for greasing the dish and helps the edges become golden, almost crispy.

The potatoes must be clean

Cut the potatoes into medium slices, thin enough to become tender but not so thin they break in the pot. A mandoline gives consistent results, and that’s important: slices of equal thickness cook together, without hard bits in the middle of the gratin. Rinse them after cutting until the water is less cloudy, as excess starch can make the sauce pasty. Once drained, they should feel firm and moist, not slippery like a purée in the making.

Pre-cooking changes everything

Put the potatoes in a large pot with the milk, broth, and a pinch of salt, then cook over gentle heat. The liquid should simmer softly, with a discreet and regular sound, not boil violently like a forgotten soup. This step tenderizes the slices before the oven and allows them to absorb some of the broth’s flavor. Stop when the tip of a knife goes in without force: if you push too far, the potatoes break and the gratin becomes heavy.

The sauce deserves its reduction

Remove the potatoes with a slotted spoon and keep the cooking liquid, because it already contains milk, broth, and starch released by the slices. Reduce it in a smaller pot until it becomes darker, more aromatic, and lightly coats a whisk. This reduction concentrates the flavor; without it, the gratin risks swimming in a too-thin sauce. Then add the cream and a handful of grated cheddar, just enough to get a smooth, warm cream with a clear melted cheese smell.

Assembly should be generous

Butter the dish, then alternate layers of potatoes, cheddar cream, and grated cheese. Don’t pack them down like a military dauphinois: leave a little space for the sauce to circulate between layers. The top should get a good amount of cheddar, because that’s what forms the golden, salty crust we go for first. If the sauce seems very thick, add a small ladle of hot broth before baking, but keep a light hand.

The oven does the real gratin

Bake at 200°C until the surface is golden, with edges slowly bubbling and some darker spots on the cheese. The gratin should smell of warm cheddar and cooked potato, not burnt milk; if the top browns too quickly, loosely cover with parchment paper. Let it rest a few minutes before serving, even if it’s tempting to dig in right away. This rest calms the sauce, prevents burning bites, and gives cleaner servings.

Tips & Tricks

Salt gradually, as the broth and cheddar can already be quite salty; it’s better to correct at the end than to end up with an unsalvageable gratin.
Don’t skip rinsing the potatoes: it removes surface starch and prevents a sticky sauce, especially if you use a very floury variety.
Grate the cheddar at the last moment, because it melts more evenly and gives a more supple crust than pre-shredded cheese from a bag.
Serve with a vinaigrette salad or crunchy green vegetables, as the acidity cuts through the cheese’s richness and makes the dish much more pleasant overall.

Close-up — The right balance: soft potatoes, thick sauce, melted cheddar, and a slightly crispy crust.

FAQs

Can this gratin be prepared in advance?

Yes, it can be prepared a few hours ahead. Keep it chilled before baking, then add 5 to 10 minutes in the oven if the dish comes straight from the fridge.

Which cheddar should I choose for this gratin?

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