Frozen banana & praline parfait

Method

• step 1

  To make the praline, put the sugar into a heavy-based pan with 3 tbsp water. Place over a low heat until the sugar has dissolved and is clear. Don't stir, or it will crystallise. Increase the heat and bubble to a dark caramel (see video technique), about 5 mins. Remove from the heat, stir through the nuts, then tip onto a lightly greased non-stick baking tray. Spread to level and leave to cool. Be careful as the tray will get very hot.

• step 2

  When the praline is cold and brittle, break it into pieces. Then, using the end of a rolling pin, smash it up until fairly well crushed. If this is proving hard work, tip into a food processor and pulse until it’s the texture of coarse breadcrumbs.

• step 3

  Line a 1.2-litre loaf tin with a strip of baking parchment (this size tin gives a neat shape, but you can set the parfait in any shaped tin, or individual pudding basins or ramekins). In a bowl, mash the bananas with half the lemon juice until you have a rough purée, then set aside.

• step 4

  Put the cream into a bowl and whip until it holds its shape but is still a little soft. In another very clean bowl and using a very clean electric whisk, beat the egg whites with a squeeze more lemon juice until stiff. Slowly add the sugar until you have a stiff, shiny meringue.

• step 5

  Gently fold the whipped cream and meringue together, then add the banana and most of the praline, leaving about 4 tbsp to serve. Spoon into the loaf tin, smooth the top and freeze until firm, preferably overnight.

• step 6

  To serve, remove the parfait from the freezer 10 mins before serving and leave in the fridge to soften slightly. Meanwhile, slice the bananas on a slant, allowing 3 slices for each serving. Lay the slices on a baking tray set on a wooden board and scatter heavily with the sugar. Use a blowtorch to caramelise the banana, then set aside. Be very careful as the tray will be extremely hot. If you don't have a blowtorch, place the slices into a hot, dry frying pan and sear the sugar-coated sides until caramelised. Lift and flip them over to a tray.

• step 7

  To plate up, sprinkle a neat line of praline just off-centre on each plate. Arrange the slices of caramelised banana at opposing angles. Unmould the parfait, then use a warmed knife to neaten the sides and cut into finger-thick slices. Lay the slice on the opposite side of the plate to the banana and serve straight away.