16 ounces semisweet gf chocolate, coarsely chopped
1-1/4 sticks (10 Tablespoons) unsalted butter, cut into 10 pieces (room temperature)
5 large egg yolks (room temperature)
5 large egg whites (room temperature)
1/4 teaspoon cream of tartar
1 Tablespoon sugar
Powdered sugar
Raspberry sauce