French Tomato Mustard Pie: A Savory Slice of Summer

The first time I tasted this pie, I was a stagiaire in a tiny bistro tucked away on a cobblestone street in Lyon. The aroma alone, a heady blend of ripe tomatoes, sharp mustard, and Provençal herbs, pulled me in from the back alley. The owner, a stout woman named Madame Dubois, handed me a still-warm slice, its flaky crust practically melting in my hand. That first bite – the tangy mustard mellowed by the sweet tomatoes and nutty cheese – transported me. I knew then that this deceptively simple tart was more than just a snack; it was a love letter to French summer.

Recipe Overview

• Prep Time: 15 minutes
• Cook Time: 30 minutes
• Total Time: 45 minutes
• Servings: 8
• Yield: 1 pie
• Dietary Type: Vegetarian

Ingredients

• 1 pie crust (store-bought or homemade, pre-baked preferred for extra crispness)
• 4 ounces (approximately 1/2 cup) French mustard (Dijon or a similar style)
• 4 ounces (approximately 1 cup) Swiss cheese, grated
• 6 medium tomatoes, sliced
• 1 teaspoon herbes de Provence
• 1 teaspoon basil, dried or fresh, chopped
• 1/2 teaspoon oregano, dried or fresh, chopped
• 2 teaspoons olive oil

Equipment Needed

• 9-inch pie dish or tart pan
• Grater
• Knife
• Cutting board
• Measuring spoons
• Measuring cups
• Oven

Instructions

1. Preheat your oven to 375°F (190°C). This temperature ensures even baking and a perfectly golden crust.

2. Prepare your tart pan or pie dish by lightly greasing it. This will prevent the pie from sticking and make it easier to remove after baking. Place the pie crust into the prepared pan, gently pressing it into the corners and up the sides. If using a pre-made crust, crimp the edges for a decorative touch. For an extra crispy crust, pre-bake it for 10 minutes before adding the filling; this will prevent a soggy bottom.

3. Now comes the flavor base. Generously spread the French mustard evenly across the bottom of the pie crust. Don’t be shy! The mustard will mellow and sweeten as it bakes, adding a characteristic tangy depth to the pie.

4. Sprinkle half of the grated Swiss cheese over the mustard layer. This creates a cheesy barrier that will help to bind the tomatoes and prevent the crust from becoming overly saturated.

5. Arrange the sliced tomatoes in a single layer over the cheese, overlapping them slightly. Choose ripe but firm tomatoes for the best texture and flavor. Heirloom tomatoes in various colors make the pie visually stunning.

6. Sprinkle the remaining Swiss cheese evenly over the tomatoes. This will create a golden, bubbly topping as the pie bakes.

7. Combine the herbes de Provence, basil, and oregano in a small bowl. Sprinkle this aromatic mixture over the cheese. The herbs will infuse the pie with their fragrant Mediterranean flavors.

8. Drizzle the olive oil evenly over the entire pie. The olive oil will add richness and help the cheese and herbs to brown beautifully.

9. Bake in the preheated oven for approximately 30 minutes, or until the crust is golden brown and the cheese is melted and bubbly. Keep a close eye on the pie during the last few minutes of baking to prevent the crust from burning. If the crust starts to brown too quickly, you can tent it with foil.

10. Remove the pie from the oven and let it cool slightly on a wire rack before slicing and serving. Allowing the pie to rest for a few minutes will help the filling to set and make it easier to cut.

Expert Tips & Tricks

• Mustard Selection: While Dijon mustard is traditional, experiment with different varieties of French mustard. A whole-grain mustard will add a delightful textural element, while a honey mustard will provide a touch of sweetness.
• Cheese Alternatives: If you’re not a fan of Swiss cheese, Gruyère, Emmental, or even a sharp cheddar would work well.
• Tomato Prep: For a less watery pie, consider salting the tomato slices lightly and letting them drain for 15-20 minutes before assembling the pie. This will draw out excess moisture.
• Make-Ahead Tip: The pie crust can be prepared a day in advance and stored in the refrigerator. You can also assemble the entire pie several hours before baking, but wait to drizzle with olive oil until right before baking to prevent the crust from becoming soggy.
• Adjust Baking Time: Every oven is different. Start checking for doneness at 25 minutes. The pie is ready when the crust is golden brown and the filling is set. A toothpick inserted into the center should come out with only a few moist crumbs clinging to it.

Serving & Storage Suggestions

This French Tomato Mustard Pie is delicious served warm or at room temperature. It makes a wonderful appetizer, light lunch, or side dish. Garnish with a sprinkle of fresh basil or a drizzle of balsamic glaze for an elegant presentation.

Leftover pie can be stored in the refrigerator for up to 3 days. To reheat, warm it gently in a preheated oven at 350°F (175°C) for about 10-15 minutes, or until heated through. You can also microwave it for a shorter period, but the crust may lose some of its crispness.

While not ideal, the baked pie can be frozen for up to 2 months. Thaw it completely in the refrigerator before reheating. The texture of the tomatoes may be slightly altered after freezing.

Nutritional Information

Nutrient	Amount per Serving	% Daily Value
Calories	194 kcal	N/A
Fat	12.7g	19%
Saturated Fat	4.6g	22%
Cholesterol	13.1mg	4%
Sodium	148.8mg	6%
Carbohydrate	14.6g	4%
Fiber	1.9g	7%
Sugars	2.6g	N/A
Protein	6g	12%

Note: Nutritional information is an estimate and may vary based on specific ingredients and portion sizes.

Variations & Substitutions

• Gluten-Free: Use a gluten-free pie crust. There are many excellent options available in stores or you can make your own.
• Vegan: While this recipe isn’t naturally vegan, you can easily adapt it. Use a vegan pie crust, substitute the Swiss cheese with a vegan cheese alternative, and ensure your French mustard is vegan-friendly (some contain honey).
• Seasonal Variations: In the fall, try adding roasted butternut squash or sweet potato slices to the filling. In the spring, asparagus or zucchini would be delicious additions.
• Herb Variations: Feel free to experiment with different herbs. Thyme, rosemary, or savory would all complement the tomatoes and mustard nicely.
• Spicy Kick: Add a pinch of red pepper flakes to the herb mixture for a touch of heat.

FAQs (Frequently Asked Questions)

Q: Can I use puff pastry instead of pie crust?
A: Yes, puff pastry can be used for a flakier crust. Just be sure to pre-bake it slightly to prevent it from becoming soggy.

Q: The mustard seems like a lot. Will the pie taste too strong?
A: The mustard flavor mellows significantly during baking, creating a subtle tang that complements the sweetness of the tomatoes.

Q: Can I use canned tomatoes instead of fresh ones?
A: While fresh tomatoes are best, you can use canned diced tomatoes, but be sure to drain them thoroughly to prevent a soggy pie.

Q: What kind of French mustard should I use?
A: Dijon mustard is the most traditional choice, but you can experiment with other varieties, such as whole-grain or honey mustard.

Q: Can I add other vegetables to this pie?
A: Absolutely! Onions, peppers, zucchini, and eggplant would all be delicious additions.

Final Thoughts

This French Tomato Mustard Pie is more than just a recipe; it’s an invitation to savor the simple pleasures of summer. With its tangy mustard, sweet tomatoes, and fragrant herbs, it’s a dish that’s sure to delight your taste buds and transport you to a sun-drenched French countryside. So, gather your ingredients, preheat your oven, and prepare to experience a truly delicious slice of culinary sunshine. And don’t hesitate to experiment with different variations and make it your own! Bon appétit!