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1
If you intend to prepare chocolate souffles, preheat the oven to 375 degrees.
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2
If you intend to serve this dish as a cold mousse, ignore this step.
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3
Combine one-third cup of the sugar and one-half cup of the water in a saucepan.
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4
Bring to the boil, stirring until the sugar dissolves.
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5
Let this mixture barely simmer.
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6
Put one-quarter cup of the sugar into the container of a food processor equipped with a metal blade.
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7
Add the egg whites.
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8
Combine the remaining two tablespoons of water and the vinegar and set aside.
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9
Start processing the egg whites for eight seconds while adding the water and vinegar through the feed tube.
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10
Process for exactly two minutes, no longer.
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11
The mixture should be thick and hold its shape.
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12
Pour and scrape the mixture into a mixing bowl.
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13
It is not necessary to clean the processor container.
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14
Return the container and blade to the machine and add the chocolate pieces.
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15
Add the remaining sugar and coffee powder into the container of the food processor.
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16
Start processing until the chocolate is very finely textured.
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17
At this point, with the machine running, gradually add the simmering syrup through the feed tube.
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18
Process for 30 seconds.
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19
Stop the machine and add the egg yolks and vanilla.
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20
Process by starting and stopping the machine four times (four short pulses).
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21
Scrape the egg whites back into the machine and combine the mixture, using a few short pulses, just until the egg whites have almost disappeared.
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22
Do not overprocess.
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23
If you are going to serve this dish as a mousse, pour and scrape it into a one-and-one-half-quart serving dish.
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24
Refrigerate at least four hours or, preferably, overnight.
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25
If you are to serve this mixture as a souffle, butter eight six-fluid-ounce individual souffle dishes, using about one teaspoon of butter for all of them.
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26
Sprinkle the inside of each with sugar, using a total of four teaspoons.
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27
Shake out the excess.
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28
Pour an equal amount of the chocolate mixture into each dish.
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29
Place in the oven and bake 12 minutes, or until well puffed and soft and creamy on the inside.
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30
Serve immediately.
