Method

• 1.
  Cut a piece of cardboard to fit inside the base of your loaf pan (we used a19.5cm x 9.5cm loaf pan). Wrap the cardboard in aluminium foil (this provides a stable base to help remove tiramisu once set). Line base and long sides with a double layer of plastic wrap with a 5cm overhang. Place the aluminium-covered cardboard over the plastic wrap in the base of the pan. Measure savoiardi against the base of the pan, trimming to fit if necessary. (Most loaf pans taper out to the top, so you may not need to trim the biscuits for the top layer.)
• 2.
  Using the base of the loaf pan as a stencil, cut 3 rectangles of baking paper and place each on top of another larger piece of baking paper on a tray. Spread 1/3 of the melted chocolate over each stencilled piece then place in the freezer on the tray. Chill for 30 minutes or until solid.
• 3.
  Combine 1 tbs coffee with 1/2 cup (125ml) hot water, sugar and marsala. Whisk until dissolved and set aside.
• 4.
  Remove ice cream from the freezer and set aside for 10 minutes to soften. Meanwhile, combine remaining 1 tbs coffee and 1 tbs hot water in a bowl and stir to dissolve. Set aside.
• 5.
  Divide softened ice cream and mascarpone between two bowls and mix to combine. Add coffee mixture to one bowl and stir to combine.
• 6.
  Working quickly, dip a sponge finger biscuit in the coffee marsala mixture and place into the pan. Repeat until the bottom is covered. Top with half of the vanilla ice cream mixture. Remove chocolate pieces from the freezer, trim, and remove baking paper. Place one rectangle on top of the vanilla ice cream, followed by remaining ice cream mixture. Repeat layering with remaining chocolate and the coffee ice cream, finishing with an ice cream layer. Freeze for 1 hour to firm up.
• 7.
  Dip remaining biscuits in the marsala mixture and place on the top of the ice cream. Freeze overnight.
• 8.
  When ready to serve, remove Viennetta-misu from the freezer and scatter with cocoa. Use the overhanging plastic wrap to carefully lift from the tin, then place on a tray and serve immediately.