Spiced Tomato Gratin Recipe

In a Indian spiced departure from a favorite Suzanne Goin recipe - this is a rustic, deeply flavorful summer gratin made with sliced tomatoes, potatoes, caramelized onions, curry powder, and a kick of red chile flakes.

Spiced Tomato Gratin

We have family visiting from out of town this week. Meaning, I've been a bit tied up, with not as much time to write. But, on the flip side, I have been cooking quite a bit. And in a change of routine, we've been eating dinners outside thanks to a new table purchase. I'm stubbornly determined to enjoy many al fresco meals sitting at it, even if it means wearing three layers of sweaters. So, for our first under-the-fog meal at our new table, I made this twist on a favorite Suzanne Goin Potato-Tomato Gratin recipe. It's a bit of a project, but worth it if you have the time and are in the mood for a slicey-dicey sort of afternoon in the kitchen.

Tomato Gratin Recipe

One of the things I like about Suzanne's gratin is the way she strikes bright, flavorful, deep and rustic notes in a preparation that isn't overly decadent. I'm not a fan of creamy starch-bomb gratins. And this is not that. Instead, you line a baking dish with layers of deeply caramelized onions, thinly sliced potatoes, ripe tomato slices, and slivered basil. The potatoes are tossed with a modest amount of cream which ends up percolating through the other ingredients while baking. On a whim, I decided to take a detour from the version in Sunday Suppers at Lucques which happens to be beautifully thyme-centric. Instead, I combined Indian curry spices with the onions, and introduced those flavors to the gratin.

Tomato Gratin Recipe

Either way, this is the sort of thing that is perfect just out of the oven. Or reheated the day after. Or the day after that. But be sure to read through the recipe entirely before committing to it - the prep takes some time, and it takes a good amount of time to bake.

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Spiced Tomato Gratin

I don't bother to peel the potatoes, but you can if you like. You're going to want to use a mandoline, if you have one, to slice the potatoes. If not, you can use a knife, it just takes a bit longer.

1 teaspoon whole cumin seeds
2 teaspoons curry powder
1/2 teaspoon red pepper flakes
1/4 cup extra-virgin olive oil

6 cups thinly sliced yellow onions (about 2 pounds / 32 oz / 910 g)

1 tablespoon unsalted butter
1 1/4 pounds / 20 ounces / 570 g Yukon Gold potatoes
1/2 cup / 120 ml heavy cream
2 pounds / 32 oz / 910 g ripe tomatoes
a small handful of basil leaves, slivered
sea salt and freshly ground pepper

Preheat the oven to 350F / 180C with a rack in the top third.

Combine the spices in a small bowl and set aside.

You can get a jump start on the onions while you slice the potatoes and tomatoes. Heat half of the olive oil, 2 tablespoons, in your largest skillet or dutch oven over high heat. When hot, stir in the onions along with a few pinches of salt. Cook for a few minutes, stirring often, until the onions soften up - 4-5 minutes. Turn the heat down to medium and stir in the butter. Stirring regularly, cook another 10 - 15 minutes at this temperature, or until the onions just begin to caramelize a bit. Dial the heat back a shade more, and cook until the onions are deeply golden, this might take another 20 minutes. A minute before the onions are finished cooking stir in the spice mixture. Remove the pan from heat and set aside the onions.

In the meantime, use a mandoline to slice the potatoes into 1/8-inch thick rounds. Place in a medium bowl along with the cream, 1 teaspoon of salt, and bit of pepper. Toss well, and set aside.

Use a knife to cut the tomatoes into 1/4-inch thick slices. Arrange across a large plate and sprinkle with another teaspoon of salt and some pepper.

Smear half the caramelized onions across the bottom of a 10x10 inch (or equivalent) gratin or baking dish. Take half of the potatoes and half of the tomatoes and arrange on top of the onion layer (see photo). Drizzle with a couple tablespoons of cream from the potatoes and a tablespoon of olive oil. Season the layer with a pinch of salt and half the basil.

Scatter the remaining onions across the potatoes and tomatoes already in the pan. Then arrange another layer of tomatoes and potatoes on top. This will be the top of your gratin, so do your best to make it look nice. Pour the remaining cream, from the potatoes, and last tablespoon of olive oil across the top. Season with another pinch of salt and the remaining basil. Gently press down on the vegetables so the cream comes up through the layers of vegetables evenly.

Cover tightly with aluminum foil and bake for 2 hours, or until the potatoes are completely tender throughout. Increase the oven to 450F / 230C, carefully uncover the gratin, and cook another 30 minutes, or until the top takes on a nice golden color.

Serves 10 as a side.

Recipe inspired by the Tomato Potato Gratin in Sunday Suppers at Lucques by Suzanne Goin, Knopf 2005.

Prep time: 30 minutes - Cook time: 180 minutes

If you make this recipe, I'd love to see it - tag it #101cookbooks on Instagram!

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great tomato season dish! will try soon


Mmmm looks great! I just wish my tomato plant was producing more fruit. What type of tomatoes did you use? HS: These were beautiful, flavor-packed San Marzanos.

Anne Marie

i am in love with tomatoes right now - what a great way to prepare them! it doesn't look too time-consuming, but then again i like to spend lots of time cooking, so maybe my view of that is a bit warped :)

heather @ chiknpastry

LOVE the introduction of Indian spices into the recipe. I tend to like to use the individual spices that comprise the curry rather than a pre-fab powder but will be trying it all the same! Thanks.

Aliya LeeKong

I've been holding out on purchasing a mandoline and testing my knife skills instead. Yet, whenever I come across recipes like this or super-thin shreds, I find a desperate need for one. Do you recommend one in particular? I looked on your site quickly for kitchen gadgets/tools you like, but didn't see it? HS: I don't love my mandoline. I keep meaning to research a new one. Anyone have one they really love?

Andrea @ Fork Fingers Chopsticks

This sounds absolutely fabulous. I may need to make it for my family this week while I'm on vacation!

Jessica @ How Sweet

Oh goodness, yum! I have all of these ingredients on hand. :) I made your lasagna tart last summer and I still think about it!

A Teenage Gourmet

This looks so beautiful and delicious. I can't wait for local tomatoes to come in season here in another week or two!


My favorite part about this recipe? "Either way, this is the sort of thing that is perfect just out of the oven. Or reheated the day after. Or the day after that." After all the prep work who wouldn't enjoy the night off from cooking the following day.

The Muse of The Day

Oh this looks amazing - I am making it tonight!


Oh I've ben looking for something o do with my potatoes! All I need is some tomatoes :)

Alex (Spoonful of Sugar Free)

All the ingredients of this dish sound really good. Summer tomatoes in a gratin... perfect idea!


Yum, that looks really good - I love the layers of flavour by way of the onions, tomato and spices - I imagine you want a tomato that is not too juicy (& therefore adding extra liquid), would that be right? HS: I think there is a bit of latitude here Kate, but yeah, I don't think you want extra-extra-juicy tomatoes. They are going to put off moisture when they cook On the flip side, they should be nice and ripe.


Always lovely to hear about a recipe that has been a regular on someone's table for several years. Surely a sign that it's worth the effort? I thought the spices in the picture were a Ras el Hanout blend when I first saw them. I wonder if that kind of direction would work too. HS: Totally agree Sophie, I bet it'd be delicious.


Love your recipe! Suzanne's cookbook is one of my favorites-- one that I always use and never lets me down-- her recipes are fabulous! In fact just went to Lucques last night and was delicious as usual : ) I will have to try your spiced up version soon!


This looks delicious, Heidi. I'll have to save it for the start of tomato season (it's just about time to start seedlings here!).


I've never thought to include tomatoes and potatoes together in the same gratin. And less cream? Sign me up! This looks delicious-plain or with Indian spices alike. Thanks for sharing :) What else did you cook for company? How do you deal with company that isn't vegetarian? HS: Let's see...Saturday night I made two recipes that I've been working on for the new book. One was a hearty pasta dish, and another was a favorite (substantial) arugula salad. And then a big pile of grilled slabs of sesame bread rubbed with garlic. All in all pretty simple, and it worked for veg/non-vegetarians. Generally speaking, I try to make it a non-issue. People generally seem fine eating vegetarian or vegan meals as long as the food tastes good and is satisfying.


hi heidi - this is beautiful! i enjoy ultra-creamy gratins every now and then (though much less so than i used to when i was, like, a teenager..,) but your version would be just what you'd need in the middle of the summer! i am curious about the original, "thyme-centric " version, as well - haven't got the book myself but will check it out when i get a chance. thanks!


I agree with the previous comment. As much as I like gratins, I tend to stay away from including them in dinner menus because they are typically so high in fat and starch. I don't mind indulging (I say that as I am about to 'indulge in limoncello ice cream:)) here and there, but I guess I'd rather indulge in other components of the meal, such as the main dish or the dessert- or even the appetizers! This is the first time I've seen this dish in a new light (literally and figuratively). I don't mind the prep work; it's like creating a beautiful masterpiece. But I definitely would like to 'indulge' in a mandolin purchase!

Torrie @ a place to share...

This looks like a deeply flavorful gratin lightened up by the refreshing ripe summer tomatoes, basil and warm spices. I do like that this version includes much less cream and butter than the traditional gratin, its wonderfully balanced.

Christine @ Fresh and Best

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