Ingredients

  • 1 3/4 cups all-purpose flour
  • 1 stick (1/2 cup) cold unsalted butter, cut into bits
  • 2 tablespoons vegetable shortening
  • 1/2 teaspoon salt
  • raw rice for weighting the shell
  • 3 pounds large onions, sliced thin
  • 1/4 cup olive oil
  • 1 tablespoon all-purpose flour
  • 2 cups half-and-half
  • 4 large eggs
  • 1 1/2 tablespoons Sherry Peppers Sauce or white-wine Worcestershire sauce
  • 1 1/2 teaspoons salt
  • 1 teaspoon minced fresh thyme or 1/4 teaspoon dried
  • 2 large tomatoes, seeded and chopped
  • 2 teaspoons extra-virgin olive oil
  • 1 teaspoon red-wine vinegar
  • 1/3 cup finely chopped fresh basil leaves
  • basil sprigs for garnish

Method

  • In a large bowl blend together the flour, the butter, the shortening, and the salt until the mixture resembles meal.
  • Add 4 tablespoons ice water, toss the mixture until the water is incorporated, and form the dough into a ball.
  • Chill the dough, wrapped well and flattened slightly, for 1 hour.
  • Roll out the dough 1/8 inch thick on a lightly floured surface, fit it into an 11-inch tart pan with a removable fluted rim, leaving a 1-inch overhang, and fold the overhang inward, pressing it against the side of the shell so the dough stands slightly above the edge of the pan.
  • Prick the bottom of the shell lightly with a fork and chill the shell for 30 minutes.
  • Line the shell with foil, fill the foil with the rice, and bake the shell in the lower third of a preheated oven for 20 minutes.
  • Remove the foil and rice carefully, bake the shell for 5 to 7 minutes more, or until it is pale golden, and let it cool in the pan on a rack.
  • (The shell may be made 1 day in advance and kept covered at room temperature).
  • In a heavy kettle cook the onions in the oil, covered, over moderately high heat, stirring occasionally, for 15 minutes.
  • Uncover the kettle and cook the onions for moderate heat, stirring occasionally, for 1 hour, or until they are golden.
  • Add the flour, cook the mixture, stirring, for 1 minute, and remove the kettle from the heat.
  • Stir in 1 cup of the half-and-half and combine the mixture well.
  • In a large bowl whisk together the eggs, the remaining 1 cup half-and-half, the Sherry Peppers Sauce, the salt, and the thyme, add the onion mixture, and combine the filling well.
  • Put the shell on a baking sheet, pour the filling into it, and bake the tart in the middle of a preheated 375F.
  • oven for 30 to 35 minutes, or until it is set.
  • Let the tart cool in the pan on a rack for 15 minutes.
  • Serve the tart warm with the tomato basil concasse garnished with the basil sprigs.
  • In a bowl combine well the tomatoes, the oil, the vinegar, and salt and pepper to taste and stir in the basil.
  • (The concasse may be made 2 hours in advance and kept covered and chilled).
  • Makes about 2 1/2 cups.