Chocolate Tart
Eight to Ten servings
Unsweetened chocolate is often labeled as 99% or 100% cacao, or bitter (as opposed to bittersweet) chocolate and it’s easy to find at any supermarket in America. In France, it’s called pâte de cacao. (In Paris, you can find it at G. Detou, in bulk.) If it’s not possible to find it where you live, you could likely get away with just using 6 ounces (170 g) of the darkest bittersweet chocolate you can find.For those new to making caramel, you can check out my post How to Make the Perfect Caramel, as well as 10 Tips for Making Caramel, to help you out and to advise with any precautions.
1 1/4 cup (250g) sugar
6 tablespoons (90ml) warm coffee
4 ounces (115g) unsalted butter, cubed, at room temperature
pinch of sea salt
4 ounces (115g) bittersweet or semisweet chocolate, chopped
2 ounces (55g) unsweetened chocolate, chopped
2 large eggs
1/4 cup (35g) flour
1 tablespoon dark rum or 1 teaspoon vanilla extract
cm One 9- or 10-inch prebaked tart shell 23– 25 cm, such as French tart dough
1. Preheat oven to 350ºF (180ºC.)
2. Spread the sugar in an even layer in the bottom of a large, heavy-duty saucepan or Dutch oven. Cook the sugar over moderate heat until the edges liquefy and being to caramelize. Use a heatproof utensil to gently drag the liquefied sugar toward the center of the pan, encouraging the sugar to melt evenly.
3. Once the sugar is melted, it was caramelize rather quickly. When it starts to smoke, but before it burns, turn off the heat and stir in the coffee. (The mixture will bubble and seize a bit. Be sure to avert your face and you may wish to wear oven mitts.)
4. If the caramel has seized up in places, stir it gently over low heat until smooth. Then add the butter and salt, and stir until melted, then stir in both chocolates until smooth*.
5. Mix in the eggs, then the flour. Stir in the rum or vanilla extract.
6. Pour the mixture into the pre-baked tart shell, then bake for 15 to 20 minutes, just until the filling starts to rise and crack at the edges but the center is still jiggly. Do not overbake.
Remove from oven and let cool completely before slicing.

Storage: Tart will keep for up to three days at room temperature, well-wrapped.

Troubleshooting: If any bits of caramel remain after adding the butter, simply stir the mixture over very low heat until they’re all completely dissolved. If any stubborn little bits remain, you can strain the buttery caramel through a mesh sieve, before adding the chocolate.

*One reader noted that they felt the mixture was too hot to add the eggs right after the chocolate, but I didn’t have any trouble. If you wish, you may let the mixture cool down a bit before adding the eggs.