Preheat oven to 180C. Whisk eggwhite in an electric mixer until stiff peaks form. Combine yolks, sugar and vanilla essence in a separate bowl, gradually stir in flours, then fold through eggwhite. Spread into a 30cm x 40cm oven tray lined with baking paper and bake until golden (35 minutes). Cool in pan, then break into rough pieces and set aside.
For crumble, beat butter in an electric mixer until pale. Stir in remaining ingredients, spread thinly on an oven tray lined with baking paper and bake until golden (35-40 minutes). Cool on tray, coarsely crumble and set aside.
For zabaglione, whisk eggs, yolks and sugar in a heatproof bowl over a saucepan of simmering water until light and foamy (15-20 minutes). Sift in flour, mix to combine, gradually add white wine and Marsala and whisk until mixture reaches 82C on a sugar thermometer and is light and fluffy (10 minutes).
Divide half the sponge mixture among ten 200ml glasses, pour over half the zabaglione, scatter over half the crumble, then repeat. Serve chilled or at room temperature.
This recipe is from the March 2011 issue of Australian Gourmet
"Trifle always looks appetising no matter how simple you keep
it. This one includes zabaglione which is one of my favourite
recipes. The trick with the zabaglione is to keep the heat moderate
and consistent and to keep whisking, adding the ingredients