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To prepare, preheat the oven to 170C and grease two 20.5cm (8in) silicone baking moulds or springform tins with butter.
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Put the flour, sugar, butter, vanilla and a pinch of salt in a food processor and pulse until the mixture clumps together into a dough. Add a few drops of water and pulse again if the dough seems a little dry.
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Divide the dough into two equal lumps and place one half into each of the round bases.
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Press each dough down to create an even biscuit base using a palette knife to smooth the top then prick all over with a fork.
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Bake for 25-30min or until the biscuits are lightly golden and allow to cool in the silicone mould/ tin.
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Spread jam in an even layer over the top of one of the biscuits still whilst still in the mould.
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Put the marshmallows in a pan with 1tbsp cold water and melt using a low heat, stirring constantly until completely melted.
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Tip the marshmallow on top of the jammy biscuit and spread evenly with a palette knife. Allow 5 -10 minutes for the marshmallow to set.
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Carefully remove the plain biscuit from it's silicone mould/ tin and place or flip on top of the marshmallow. Add a light pressure to stick the whole lot together.
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Melt 125g of the chocolate in the microwave or in a bowl over simmering water.
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Stir 1/4tsp oil into the chocolate and mix really well. Pour the chocolate all over the top of the layers of biscuit using a palette knife to get a nice even coat as level as possible.
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Chill your wheel for 2 hours in the fridge until that bad boy has set.
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Protect your work surface with a board or baking tray (trust me you don't want your issues catching you spilling chocolate all over the show in this next bit). Place a wire rack over the protected surface and place you wheel chocolate side down on the top.
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Heat the remaining 200g of chocolate as you did before and stir in 3/4 tsp of oil. Stir in well until completely combined.
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Fun part... pour the chocolate over the biscuit using a palette knife to spread over the top and sides, trying to make it as smooth as possible.
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Leave the wheel to set at room temperature before cutting into triangles and enjoying as a lovely nostalgic treat!