White Chocolate-Raspberry Tart, With Almonds and Pistachios

INGREDIENTS

• 2 cups plain flour (all-purpose flour)
• 3/4 cup butter, cut into small pieces
• 1 tablespoon caster sugar (fine granulated)
• 1 egg, beaten
• 2 -4 tablespoons cold water
• 1 lb good quality white chocolate, broken into pieces
• 6 tablespoons butter
• 2/3 cup whipping cream
• 1/2 teaspoon vanilla or 1/2 teaspoon almond extract
• 2 cups fresh raspberries, must be fresh, not frozen
• 1/4 cup sliced almonds, toasted
• 1/4 cup pistachios, toasted and roughly chopped
• icing sugar, for dusting (powdered sugar)