blue cheese and red potato tart

INGREDIENTS

• 1 Savory Tart Shell, below, or recipe of your choice, in a 9-inch tart pan and ready to fill
• 1 pound small red potatoes, scrubbed and cut into 1/4-inch slices
• 1 cup heavy cream
• 1 large egg yolk
• 1/4 pound blue cheese, crumbled (about 3/4 cup)
• 1 tablespoons finely chopped herb or herbs of your choice, such as a mixture of thyme and rosemary
• Fine sea salt for sprinkling
• 1 1/4 (5 1/2 ounces) cups flour
• 1 tablespoon plus 2 teaspoons cornstarch
• 1/4 teaspoon salt
• 6 tablespoons (3 ounces) butter, diced
• 1 large egg