Pretty pink bars

Description:
A party in a tray, this pretty pink sponge with marble icing is heaven.

Main ingredients:
Dairy, Flour, Fruit, Eggs, Sugar

Ingredients:
300g butter, at room temperature
120g golden caster sugar
2 tsp vanilla extract
1 large egg yolk
500g plain flour
400g raspberry jam
500g icing sugar
Pink food colouring

Method:
Preheat the oven to 180°C / 350°F / Gas mark 4
Line a 20 x 30cm baking tin with greaseproof paper or baking parchment.
Whisk the butter, caster sugar, vanilla and egg yolk together in a large bowl until pale.
Stir in the flour with a pinch of salt using a wooden spoon then your hands to combine everything together into a crumbly dough.
Press half into the base of the tin evenly and smooth down the top.
Spread the jam over, leaving a 1cm empty border all around the edges.
Crumble over the remaining mixture, then pat down, being careful not to disturb too much of the jam. It will look a bit patchy but that is fine.
Bake for 35 minutes until pale golden and leave to cool in the tin.
Once cool, sift the icing sugar into a bowl, and stir in 100 ml of water with some food colouring to a thick but runny icing and when you have achieved the colour preferred, pour over everything and tilt the tin to evenly spread.
Dot over a little more food colouring, then use a skewer or toothpick to swirl and marble the top.
Leave to set overnight until the icing is hard then cut into bars.
Will keep in a tin for up to five days.