Make the raspberry coulis by heating all the ingredients in a pan for a few minutes. Leave aside to cool while you get the cake batter going.
100 g raspberries, 1 Tbsp water, 2 tsp caster sugar, 1 squeeze lemon juice
In a mixer, cream the butter and sugar until smooth.
220 g salted butter, 220 g caster sugar
Add the eggs, one at a time, beating for a minute before each addition. If your cake batters have a tendency to curdle, just add a tsp of flour with each egg. As there are only 4 eggs here, a tsp will suffice. Big batches (10 eggs and above) would probably do better with 1 tbsp.
4 eggs
Fold in the flour, scraping down the sides, until just combined.
250 g self raising flour
Using a wooden spoon, add the curd and the coulis, stir gently, with a light hand, again until just combined. Over stirring cake mixtures will give you a stiffer and denser cake. Don’t worry about streaks.
80 g lemon curd, 40 g raspberry coulis
Pour in the cake pan and bake for 60-80 minutes until the edges are just coming away or a skewer inserted comes out clean.
Leave to cool completely on a wire rack.
The Lemon Curd Buttercream Icing
Place the butter in a bowl and beat until light and fluff, about a minute.
200 g salted butter
Add the icing sugar and beat until thoroughly combined and smooth. You’ll end up with a very pale cream mix.
1 kg icing sugar
Add the water and lemon curd and beat lightly to mix.
1 Tbsp water, 100 g lemon curd
Divide the icing into 2 equal parts and lightly colour one half with the red food colouring.
tiny amount of red food colouring
Icing the Lemon and Raspberry Rose Cake
As there is an inordinate amount of icing to be applied, we’ll only fill the cake with jam.
Slice the cake and fill it with the raspberry jam.
½ cup raspberry jam
Using the offset spatula, apply a layer of thin icing all over, thin in with 1 tsp water if it doesn’t glide easily. This first coat is called the crumb coat as it literally flattens/smooths the crumbs and acts as a glue for the next layer, whether it’s the piped roses, another layer of buttercream or fondant. Leave aside to crust slightly, 5 minutes in this case is enough as you want it to be tacky enough for the roses to cling on to.
Fit the nozzle to the icing bag.
Fill the icing bag one different spoonful at a time, i.e., start with the cream coloured icing, followed by the pink/red icing, back to cream and so on. Which goes first doesn’t matter.
Take a deep breath (!), chill out, and start piping large roses that will cover the whole height of the cake. You want to start in the middle and go right around in one direction.
As you do the next rose, allow the edge to overlap it the one next to it slightly. This will reduce the amount of “empty space” that will need filling up.
When you are done with the side, start the top, in the same fashion as before, doing the outer circle, overlapping slightly again. When you’ve made a circle, you’ll just have one rose in the middle to do.