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Lemon souffle is thin because there is no fruit juice. When slightlly thicker, leave it to rest and when it cools it should start to set. If it does not, it means the gelatine is probably ineffective. Try a fresh packet or increase the gelatine to 1 1/2 tbsp.

http://niruskitchen.com/recipes/details.asp?recipe_id=293&category_id=38

The one in which 1 cup = 240g

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