Put oven rack in middle position and preheat oven to 350°F. Butter a 9-inch springform pan and line bottom with a round of parchment or wax paper, then butter paper.
Melt chocolate and butter in a large metal bowl set over a pan of barely simmering water (or in a microwave-safe large glass or ceramic bowl in a microwave at 50 percent power for 4 to 5 minutes), stirring frequently, then cool completely. Whisk in vanilla, salt, and 6 tablespoons sugar. Add yolks 1 at a time, whisking well after each addition. Whisk in flour.
Beat whites with a pinch of salt in a bowl using an electric mixer at medium-high speed until they hold soft peaks, then add remaining 6 tablespoons sugar a little at a time, beating, and continue to beat until whites hold stiff glossy peaks.
Whisk about one fourth of whites into chocolate mixture to lighten, then fold in remaining whites gently but thoroughly. Pour batter into springform pan, spreading evenly.
Bake until a wooden pick or skewer inserted in center comes out with moist crumbs adhering, 35 to 40 minutes.
Cool cake in pan on a rack 10 minutes. Remove side of pan and cool cake completely. Invert cake onto rack and remove bottom of pan, discarding paper, then invert cake onto a plate.
Cooks' note: Cake (removed from pan) can be made 1 day ahead and kept, wrapped in plastic wrap, at room temperature.

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	547.04 Kcal (2290 kJ)
Calories from fat	388.51 Kcal
		% Daily Value*
Total Fat	43.17g	66%
Cholesterol	214.99mg	72%
Sodium	151.02mg	6%
Potassium	58.93mg	1%
Total Carbs	38.45g	13%
Sugars	29.84g	119%
Dietary Fiber	0.97g	4%
Protein	6.15g	12%
Vitamin A	0.4mg	14%
Iron	1.1mg	6%
Calcium	57.5mg	6%

Amount Per 100 g
Calories	412.96 Kcal (1729 kJ)
Calories from fat	293.29 Kcal
		% Daily Value*
Total Fat	32.59g	66%
Cholesterol	162.29mg	72%
Sodium	114mg	6%
Potassium	44.48mg	1%
Total Carbs	29.02g	13%
Sugars	22.52g	119%
Dietary Fiber	0.73g	4%
Protein	4.65g	12%
Vitamin A	0.3mg	14%
Iron	0.8mg	6%
Calcium	43.4mg	6%

* Percent Daily Values are based on a 2000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
Find out how many calories should you eat.

Tastes

salty
savory
bitter
sweet

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