Chocolate and meringue terrine with fudge sauce

Name: Chocolate and meringue terrine with fudge sauce
Yield: Serves 8
Cuisine: French
Ingredients: 1 litre cream; 25 g icing sugar; 250 ml cream; 100 ml water; 400 g castor sugar; 160 g butter, softened; 140 g castor sugar; 75 g Belgian dark chocolate, melted; 75 g cocoa powder; 15 g icing sugar; 15 g ground almonds; 4 egg yolks; grated rind of half an orange; half a teaspoon white vinegar; small pinch salt; 3 egg whites; 2 eggs, separated; 25 g castor sugar; 120 g icing sugar; 4 heaped tablespoons roasted and crushed pecan nuts