📌 Potato Gratin with Poultry Chorizo, Tomato, and Béchamel

Posted 25 April 2026 by: Admin #Recipes

Prep Time

25 minutes

Cook Time

45 minutes

Total Time

1 hour 10

Servings

4 to 6 servings

The first thing that hits you is the smell. Even before you open the oven, that warmth filled with melted cheese and reduced tomato spreads throughout the kitchen. This potato gratin with poultry chorizo, tomato, and béchamel is the kind of dish you serve when you want people to feel truly welcomed — without having spent the entire day in the kitchen.

Final result — The gratin served directly in its dish: generous layers of potato, chorizo, and golden béchamel announcing a seriously comforting meal.

Placed on the table, it impresses even before it’s served. The surface is golden like a light caramel, slightly cracked at the edges, with small bubbles of béchamel that have browned as they caramelized against the side of the dish. Beneath this crust, you can guess the layers: the red of the tomato, the creamy beige of the béchamel, the pale slices of potatoes. When you dig in with a spoon and lift the first helping, it holds together just right.

Why you’ll love this recipe

✓Zero stress on the big night : Assemble the dish in advance, put it in the fridge, and pop it in the oven 40 minutes before sitting down to eat. That’s it. The oven does the work while you enjoy your guests.

✓Every bite is different : Depending on where you scoop — at the top, it’s crispy cheese. In the middle, the béchamel and tomato blend together. Right at the bottom, the potato has absorbed all the flavors of the chorizo.

✓Even better the next day : Leftover gratin reheated the next day has something extra. The tomato sauce concentrated overnight, and the flavors melded together. Make extra on purpose.

✓Effortlessly adaptable : Extra zucchini, mozzarella instead of Gruyère, spicy chorizo instead of mild. The structure of the dish handles all variations without flinching.

Ingredient Notes

Ingredients

All the ingredients gathered before starting: simple things, but well chosen, for a gratin that keeps its promises.

Potatoes : Charlotte or Monalisa preferably. They hold up better during cooking and won’t turn into mash after 35 minutes in the oven. Cut them into 3 to 4 mm slices — a mandoline is perfect, but a knife works too if you are consistent.
Poultry Chorizo : It comes in mild and smoked versions — go for the smoked one; it gives the dish the most character. Make sure to remove the skin before cutting: it stays tough during cooking and ruins the texture. In thin slices, it melts better and flavors the sauce more.
Diced Tomato Pulp : A good quality can does the job without any fuss. If you want more body, drain the pulp slightly before adding it — the sauce will be less liquid and the layers will hold together better when sliced.
Grated Gruyère : Not a “pizza” or “4-cheese” blend. Just Gruyère, period. If possible, grate it at the last moment; it melts more evenly and browns better — it’s what gives that cracked crust you scrape off the edges of the dish.
Whole Milk for the Béchamel : Whole, not semi-skimmed. Béchamel with low-fat milk is thinner and less flavorful. This isn’t a minor detail when the béchamel is the glue holding the whole dish together.

Potatoes First

We start here, and it’s a step you shouldn’t skip. Peel the potatoes, cut them into even slices, and plunge them for 10 minutes into a large pot of well-salted boiling water. They should be slightly tender — a knife tip should go in with a little resistance. Not soft. They will spend 35 minutes in the oven afterward and continue cooking; if they are already overcooked now, you’ll end up with mash between the layers. Drain them and let them cool slightly on a clean towel before assembling.

Chorizo Gets Some Color

In a pan with a drizzle of olive oil, sauté the chopped onion and minced garlic until translucent. Then add the poultry chorizo slices. At this point, the pan starts to smell like a mix of smoked paprika and warm charcuterie — that’s the signal that the chorizo is releasing its fat and browning slightly. Pour in the tomato pulp, salt sparingly, pepper, and add Herbes de Provence if you like. Simmer for 10 minutes over low heat. The sauce should thicken slightly and turn from bright red to a deeper brick red.

Lump-Free Béchamel — Promised

Melt the butter in a saucepan over medium heat. Add the flour all at once and whisk immediately for about 1 minute — the mixture should form a smooth, slightly sandy paste, which is the roux. Then, pour in the milk gradually, in several additions, whisking between each. The critical moment: when the béchamel starts to thicken and bubble, lower the heat and whisk for another 2 minutes. It should coat the back of a spoon and pull away slightly from the sides. Season with salt, pepper, and a pinch of nutmeg. Taste. Adjust.

Assembling the Gratin

Preheat the oven to 180°C. In your gratin dish, start with a layer of slightly overlapping potatoes. A layer of tomato-chorizo filling on top. Then a little béchamel. Repeat until you run out of ingredients — two or three rounds depending on the size of your dish. Always finish with the béchamel and cover generously with grated Gruyère. Bake for 30 to 35 minutes. The top should be golden like light caramel, with some darker spots at the edges where the béchamel has caramelized. Let it rest for 5 minutes before serving — not out of patience, but because the layers need to stabilize to hold up on the plate.

Tips & Tricks

Don’t skip par-boiling the potatoes — it’s the difference between a meltingly soft gratin and one where the bottom layer is still hard after an hour in the oven.
If you prepare the gratin in advance, wait until it’s completely cooled before putting it in the fridge with the cheese on top — otherwise, the Gruyère absorbs moisture and won’t brown as well.
Smoked poultry chorizo adds much more character than the mild version — if you have the choice, that’s the one to use.

Close-up — The detail that says it all: melted cheese, creamy béchamel, melting chorizo — one bite and the dish is adopted.

FAQs

Can I prepare this gratin in advance?

Yes, and it’s even recommended. Assemble all the layers the day before, cover the dish with plastic wrap, and store in the refrigerator — without the Gruyère. Add the cheese just before baking; otherwise, it absorbs moisture and won’t brown correctly. Allow for an extra 5 minutes of cooking time if the dish comes straight from the fridge.

Can this gratin be frozen?

Yes, but preferably before baking. Assemble the gratin, wrapped in plastic, and freeze without the cheese. Let it thaw overnight in the refrigerator before sprinkling with Gruyère and baking. The result is very good, although the texture of the potatoes might be slightly different.

My béchamel has lumps, how can I fix it?

Use an electric whisk or an immersion blender for a few seconds — the lumps almost always disappear. To avoid them, the trick is to pour cold milk in several additions over the hot roux, whisking well between each. Not all at once.

What can I substitute for poultry chorizo?

Beef chorizo works very well with a similar flavor profile. You can also use poultry merguez cut into rounds for a spicier version, or simply add a teaspoon of smoked paprika to the tomato sauce if you want to avoid cured meats.

What cheese can I use instead of Gruyère?

Emmental is the closest substitute and behaves similarly when cooked. Mozzarella gives a stretchier, less “gratin” result. Comté brings more character. Avoid “pizza” or “4-cheese” blends which melt unevenly.

How long does the cooked gratin keep?

Three days in the refrigerator in a covered dish. To reheat, cover with aluminum foil and bake for 15 minutes at 160°C — it regains almost its original texture. The next day, the flavors are even better: the tomato sauce has concentrated and everything has melded perfectly.