French Tomato Mustard Tart

French Tomato Mustard Tart

French Tomato Mustard Tart

Choose ripe tomatoes, although they shouldn’t be too soft to the touch. Round, large, heirloom or even cherry tomatoes (sliced in half) all work well. However, I don’t recommend plum tomatoes as they have too much juice.  With two or three layers of sliced tomatoes, this tart can end up very watery once baked as the tomatoes will release their juices. To avoid this issue, slice the tomatoes, sprinkle them generously with salt on both sides and lay them in a single layer on a cooling rack for 2 hours so they release most of their excess juices.  Likewise, another tip is to sprinkle 2 or 3 tablespoons of bread crumb at the bottom of the crust (on top of the mustard and cheese). The breadcrumbs will absorb the juices from the tomatoes and prevent the crust from getting soggy. Finally, make sure your oven is well preheated to 425F (220C) and pop the tart in the oven as soon as you are done placing the tomato slices on the crust. This “shock” of temperature will make the crust bake quickly before it has time to absorb the juice of the tomatoes.


2lbs (900g) ripe tomatoes

2 tsp. salt

1 (370g) ready-rolled puff pastry

2 T. Dijon Mustard

2 cups (200g) grated cheese (ie. Gruyère or Comté)

Optional: 2 T. bread crumbs

2 T. Herbs de Provence

Salt and freshly ground black pepper, to taste


Two hours before, slice the tomatoes and lay the slices on a cutting board. Salt them on both sides and lay them flat on a cooling rack. They will loose some of their juice so the crust doesn’t get too soggy when baking.  Pre-heat your oven to 425F (220C) with a rack in the middle. Butter and flour a 9 or 10 inch tart pan/pie dish. Unroll the puff pastry sheet and fit it into a pan. If needed, cut the excess that hangs from the edges. Poke the dough all over with a fork. Evenly spread the Dijon Mustard over the bottom. Sprinkle 1 1/2 cup (150g) of grated cheese on top. Optional: Sprinkle 2 tablespoons of bread crumbs – they will absorb the juice from the tomatoes. Arrange the tomato slices in the pastry crust in an overlapping pattern and in an even layer. Sprinkle with a pinch of salt and Herbs de Provence. Repeat the process until no tomato slices remain; you should be able to have three layers of tomato slices. Sprinkle again with a pinch of salt, black pepper, Herbs de Provence and the remaining 1/2 cup (50g) of grated cheese. Bake for 35-40 minutes, until the crust looks crisp and golden. Enjoy warm or cool.  (I saw this with a short crust in mini tins)

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