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- Soak the gelatine for quarter of an hour in cold water to soften.
- Bring the tomato sauce, together with the tarragon, to the boil and reduce it by two-thirds of its volume. Stir in the gelatine and allow to cool.
- Whisk the egg whites to a soft snow in a bowl beating them, gently at first, with the balloon whisk to break them down. Gradually increase t