Ingredients

• 3 cups all-purpose flour
• 12 tablespoons (1 1/2 sticks) cold unsalted butter, cut into 1/2-inch pieces
• Kosher salt and freshly ground black pepper
• 3 tablespoons extra-virgin olive oil
• 4 tablespoons cold water
• 1 tablespoon Dijon mustard
• 1/2 cup grated Gruyere cheese
• 4 plum tomatoes, cut into 1/2-inch slices, seeds removed
• 6 ounces Camembert cheese, sliced into 1/8-inch strips
• 1/2 cup extra-virgin olive oil
• 2 tablespoons finely chopped fresh basil
• 2 tablespoons finely chopped fresh parsley
• 2 teaspoons finely chopped fresh thyme leaves
• 1 clove garlic, finely chopped