Valencian Orange Tart

Chocolate Crust
from Baking with Julia

1 1/4 cups all-purpose flour
1/4 cup unsweetened cocoa powder, preferably Dutch-processed
1/4 cup sugar
1/4 tesp salt
1 stick (four ounces) cold, unstalted butter, cut into small cubes
1 large egg yolk
1 TBS +/- ice water

Using a food processor, blend dry ingredients.  Add butter and pulse until you have small pebbles of butter/flour.  Stir together the egg yolk with water and add to the flour mixture with the machine running.  Pulse in short bursts until mixture is crumbly. Pour onto a large piece of plastic wrap and gather dough together.  Chill at least 30 minutes.

To bake, roll chilled dough out and press into an 11 inch tart pan with removable bottom.  Chill the crust in the tart pan for at least 30 minutes. Prick the bottom of the crust with a fork at regular intervals.  Bake in the center of a preheated 350º oven for about 12 minutes, rotating the tart halfway through the baking time.  Remove and allow to cool before filling.

Orange Filling

4 to 5 medium thin-skinned oranges, scrubbed well
2 1/2 cups fresh orange juice
1 cup sugar, plus more for caramelizing the tart
1 TBS grated orange zest
2 tsp orange flower water (optional, available in Middle Eastern markets)
1 cup orange marmalade

Mix the orange juice, sugar, orange zest and orange flower water (if using) in a wide pot and bring to a simmer over medium-high heat.  Stir to dissolve the sugar.

Using a sharp knife, slice the oranges about 1/8 inch thick, discarding the tops and bottoms of each orange.  Add the orange slices to the juice and simmer, partially covered, over low for about 15 minutes.  The slices should be submerged in the liquid, if not add a little water. Allow the oranges to cool in the liquid, then drain and pat the slices dry with paper towels.  Cut the dried slices in half.

To assemble and bake the tart, spread the marmalade across the bottom of the cooled crust.  Working from the outside in, lay the halved orange slices in concentric circles, overlapping slightly.  Bake on the center rack of a preheated 375º oven for 30 minutes until the oranges are very soft and lightly browned.

Sprinkle a thin layer of sugar on top of the baked tart and caramelize with a blowtorch.  Von Bremzen says you could also do this under a preheated broiler, but I think that's much more difficult to control, at least I wouldn't trust my broiler.

Let the tart cool to room temperature before serving.