Prepare an ice water bath. In a small saucepan, heat the water and sugar, stirring occasionally, until the sugar is dissolved. Add the chocolate and melt until smooth, stirring constantly. Set pan in water bath to cool, then place in the refrigerator until thoroughly chilled but not set. If it sets up, stir it over low heat until it’s mostly melted but not hot. Whisk until smooth. Whip the cream and vanilla to stiff peaks and fold in the white chocolate mixture. Pour over kiwi jelly.