📌 Noirmoutier New Potato Tatin, Caramelized Onions and Fresh Sea Beans

Posted 6 May 2026 by: Admin #Recipes

Prep Time

20 minutes

Cook Time

50 minutes

Total Time

1h10

Servings

4 servings

Sweet Tatin scares people — burning caramel, catastrophic unmolding, collapsing apples. The savory version with Noirmoutier new potatoes is a different story. Calm, generous, and impossible to fail if you simply give it time.

Final result — The tatin flipped onto its serving dish, with its golden new potatoes and fresh sea beans added at the last minute.

On the plate, the slices of new potatoes form a rosette as shiny as light caramel, slightly translucent at the edges, with those little pockets of honey-balsamic sauce that reduced during cooking. The rising scent is both sweet and pungent — the melted onions absorbed all of that for fifty minutes. The raw green sea beans provide a contrast to the warm brown of the tart. Under the fork, the potatoes yield without resistance, almost melting, while the sea beans offer a slight crunch.

Why you’ll love this recipe

✓Zero difficult techniques : The pastry covers everything, so nothing needs to be perfect underneath. The onions, potatoes, sauce — it all works itself out in the oven.

✓Noirmoutier new potatoes do 80% of the work : This variety has a natural waxy texture and a slightly buttery taste that you don’t get with ordinary potatoes. They are what make this dish memorable.

✓It’s eaten warm, not piping hot : A practical advantage for meals with guests: you can make it in advance, flip it when needed, and it stays good for 30 to 40 minutes at room temperature.

✓Sea beans change everything : This small, briny, and crunchy vegetable placed raw on the hot tatin brings exactly the right amount of freshness and natural salt to balance the sweetness of the caramel.

Ingredient Notes

Ingredients

Everything needed for this savory tatin: Noirmoutier new potatoes, onions, honey, balsamic vinegar, and a nice handful of sea beans.

Noirmoutier New Potatoes : The skin is so thin that we don’t peel them — it’s intentional, as it melts during cooking. If you can’t find Noirmoutier specifically, use Charlotte, Ratte, or Amandine. The key is that the variety must be waxy and hold together after boiling.
Fresh Sea Beans (Salicornia) : Found in season (spring-summer) at good greengrocers, specialty stores, or coastal markets. If you can’t find any, arugula or watercress will do for bitterness and freshness — it’s different, but it works.
Honey and Balsamic Vinegar : The duo that makes the sauce. Honey brings sweetness and shine, balsamic brings acidity and depth. No need for a 20-year-old balsamic — a supermarket one is more than enough here.
Shortcrust or Puff Pastry : Shortcrust: stays crispy even in contact with the sauce, easier to handle. Puff: becomes tender underneath and well-browned on top, it’s more indulgent. Store-bought is fine, homemade is better if you have ten minutes to spare.

Onions first — and don’t rush them

Caramelized onions are the foundation of everything. Slice them not too thin — strips of 4 to 5 millimeters — and let them melt over very low heat in butter and a drizzle of oil. Twelve minutes minimum. You should barely hear a sizzle, that’s intentional: no sharp browning, just a slow transformation. When they are translucent and very soft, add the honey, balsamic vinegar, and thyme. Another five minutes on low heat. The sauce will take on a dark mahogany color and a slightly sweet-sour smell that already hints at what the tatin will become.

A quick bath for the new potatoes, then let them cool

While the onions are doing their thing, submerge the whole potatoes in a pot of well-salted cold water. Bring to a boil and count ten minutes from the first bubbles. They should be half-cooked — the blade of a knife goes in, but with slight resistance in the center. Drain and let them cool completely before slicing. If hot, they’ll mash. If cold, they cut cleanly into thick rounds that will hold well in the rosette.

Arrange the rosette, cover with pastry, and stop overthinking

Preheat the oven to 200°C. In a cake pan, first distribute the onions in an even layer. Then arrange the potato slices in slightly overlapping circles — start from the outside, finish in the center. Salt and pepper. Unfold the pastry directly over the top and tuck the edges inside the mold, as if tucking the tatin into bed. It doesn’t need to be perfect. The important thing is that the pastry touches the edges to hold the sauce during cooking.

Don’t touch a thing for ten minutes after the oven

Bake for thirty minutes, until the pastry is well-browned — not pale gold, but truly golden, like light caramel. Remove the tatin and resist the urge to flip it immediately. Ten minutes of rest in the pan is what makes the unmolding go smoothly. Place a plate upside down on the mold, press firmly, and flip with a decisive motion. The potatoes appear in a rosette, shiny with caramelized sauce. Add the fresh sea beans and some microgreens at this precise moment — not before, otherwise they soften and lose their appeal.

Tips & Tricks

If your new potatoes are very small (less than 3 cm in diameter), leave them whole and arrange them flat in the mold — it’s even prettier and more melting in the mouth.
A tiny drizzle of oil in the bottom of the pan before adding the onions prevents them from sticking, especially if your pan is not non-stick.
The tatin can be reheated for ten minutes at 160°C the next day. It loses a bit of crunch, but the flavors are even more developed on the second day.

Close-up — A close-up of the caramelized and shiny crust of the tatin at the moment of unmolding, with sea beans providing their briny touch.

FAQs

Can I prepare the tatin in advance?

Yes, and it’s even recommended. The caramelized onions can be made the day before and kept in the refrigerator in a covered bowl. On the day of, you just need to assemble and bake. The cooked tatin reheats perfectly for 10 minutes at 160°C — flavors are often even better the next day.

What if I can’t find sea beans?

Sea beans (salicornia) are seasonal (spring-summer) and not always easy to find. Arugula or watercress work very well for bitterness and freshness. If you want to keep the marine and briny note, a few rinsed capers added at the last moment also work.

Shortcrust or puff pastry — which one to choose?

Shortcrust stays crispy in contact with the sauce and holds up better during unmolding: it’s the safer choice. Puff pastry becomes soft underneath and very golden on the surface, which is more indulgent but a bit more fragile. Both work — it’s a matter of preferred texture.

How do I prevent the tatin from sticking to the pan?

A drizzle of olive oil at the bottom of the pan before the onions is usually enough. If your pan is not non-stick, line it with a disk of parchment paper cut to the size of the bottom — that settles the problem once and for all without changing the recipe.

Can I use potatoes other than Noirmoutier new potatoes?

Yes. The important thing is to choose a waxy variety that holds up well during cooking: Charlotte, Ratte, or Amandine work very well. Avoid starchy varieties like Bintje — they collapse after boiling and the rosette won’t hold.

How do I know if the tatin is properly cooked?

The pastry should be golden like light caramel over the entire surface — not pale, not brown. By slightly lifting the edge of the pastry with a knife, you should see the sauce bubbling slightly on the sides. If the pastry is still pale in the center, leave it for another 5 minutes at 210°C.