Heirloom Tomato Tart with Gruyère & Thyme

It was such a pleasure making this tart. Bogdan and I met up with some friends at Eastern Market on Saturday and there were beautiful heirloom tomatoes everywhere. I didn’t have any plans for them but I had to have some. Just look how beautiful they are. Slicing them for this tart was almost as good as eating the finished product. The smell of sweet fresh tomatoes filled my kitchen and I couldn’t have been happier.

I’ve seen quite a few tomato tarts on Pinterest lately and they all look so wonderful. I decided that would be the best way to highlight the tomatoes while also making something really eye-catching. You know what’s amazing about food? The sheer variety of preparation methods that can transform virtually the same ingredients from a margherita pizza to a rustic tomato tart. It’s incredible.

So about this tart. It looks really impressive but it’s surprising how simple it is to make. I made my own pie dough (recipe & instructions below) but you can substitute store bought if you prefer – that would make it even simpler. I think I used about 250 grams / 8.8 oz of tomatoes.  I used the small ones because I liked the look of it but you can also use large ones or even both. They have to be sliced thinly then laid out on a paper towel lined surface and sprinkled with salt so they release water and you don’t end up with a runny pie. It’s really easy to over-salt so just remember while you’re salting that what you sprinkle on the tomatoes to release water will also end up in your tart.

Gruyère and thyme has been my favourite combination lately. I bought a little thyme bush from the farmers market a couple weeks ago and I’ve been using it in everything. The combination of gruyère and thyme is a classic. It lets the tomatoes shine while still adding a bit of interest. I garnished with a small sprig of basil just for appearances but you could also fully substitute basil and pecorino for the gruyère and thyme.

You’ll notice that there aren’t a lot of ingredients in this tart. Simple preparations like this are meant to highlight the quality of the few ingredients used. In this case, the tomatoes were really the star of the recipe and their quality and taste was noticeable. Try to take advantage of the harvest heirlooms available at farmers markets this time of year. Also, if at all possible don’t shy away from making your own pie dough. Not only does it taste infinitely better than store bought, but it also isn’t full of preservatives, stabilizers, colours and whatever else  store bought doughs are always full of (have you ever looked at the ingredients? It’s scary). The flour you choose makes a big difference too. My personal favourite (for almost everything I make) is Antimo Caputo Chef’s “00” Flour, however, for pastry it’s best to avoid a high gluten flour and use an AP instead. As always, unbleached is always better.

Unless you have somewhere you can buy all natural pie dough, make it yourself. It’s part of the experience. The secret is just to keep all the ingredients super cold – then it’s (almost) fool-proof. Also, this particular dough is made with a combination of lard and butter, which provides an ideal flour-to-fat ratio. If you don’t have or prefer not to use lard it’s best to substitute vegetable shortening instead of more butter because all butter can make for a mealy pie dough that’s hard to work with.

The recipe here is adapted from the recipe in The Professional Pastry Chef by Bo Friburg. I cut the recipe in half, reduced the salt and changed the method a little bit.

Pie Dough


350 grams / 12 oz unbleached AP flour

1 tsp salt

225 grams / 8 oz cold salted butter (very cold)

70 grams / 2.5 oz lard or vegetable shortening (very cold)

Approximately 1/3 of a cup ice water


** A well known pie dough making hack is to grate frozen butter or lard. This is a great idea and makes the process much easier. However, know that if you do grate it you should refreeze for 10-15 minutes in case it’s warmed up from your body heat or the friction of the grater.

Combine flour and salt in a large bowl. Add the butter and lard and quickly mix without handling it too much until just incorporated.

Sprinkle on the ice water and mix just until the dough comes together. It should still look chunky.

Flatten with a rolling pin, cover and let rest in the freezer for at least 30 minutes. My preferred method is to roll it out on a large sheet of aluminum foil, then fold over the edges and put it into the freezer as is. When I take it out I can flip it upside down and lay it into my tart shell then peel off the foil with little damage to the dough.

When the dough has chilled enough, press it into a tart shell. I used a very shallow (about 1 inch / 2.5 cm) tart pan that’s 10 inch / 25 cm across. I had a small handful of dough leftover so I think this would be enough to cover a 2 inch deep pan as well (especially if you don’t make the crust as thick as mine was).

Blind bake the tart dough (without anything in it) at 375 F / 190 C for 15 minutes. You can use pie weights or beans if you choose but I generally don’t.  You can move on to the tart recipe at this point.

When finished baking, remove from heat and assemble following instructions below. Leave the oven on.

**Makes about 700 grams / 1.5 lbs of pie dough.



250 – 300 grams fresh heirloom tomatoes (either cherry or full sized)

1 prebaked pie or tart crust

1 TBSP fresh thyme + a bit more for garnish (fresh really makes a difference but if you have to use dry then substitute 1 tsp dried thyme for 1 TBSP fresh)

100 grams / 3.5 oz grated gruyère + more for garnish (after baking)


Thinly slice the tomatoes (as thin as you have the patience for) and lay them out on a paper towel lined surface. Sprinkle with salt and let them sit for at least 30 minutes so they release water and you don’t end up with a runny pie. It’s really easy to over-salt so just remember while you’re salting that what you sprinkle on the tomatoes to release water will also end up in your tart.

Take your tart or pie shell and sprinkle 1/3 of the thyme, then 1/3 of the cheese and layer on enough tomatoes to cover. Repeat for 2 more layers, using the rest of the ingredients. I had a few tomato slices leftover that I just ate as they were. If you have leftovers or not enough, adjust accordingly The tart should be relatively full so if you use a 2 inch tart pan then you’ll need to double your filling. PS: The top of the tart should be tomatoes and not cheese because the cheese will harden unpleasantly.

Bake at 375 F / 190 C for 15 – 20 minutes or until crust is a nice golden colour and tomatoes have dried.

Remove from heat and allow to cool 10-15 minutes. Sprinkle with more thyme and gruyère.