See the above blog post for step by step pictures.
Once the cakes are completely cooled, begin to make each layer as similar in size as possible. Usually you will only have to cut the tops off of each cake layer. With a sharp knife, remove the tops from each cake layer until each are flat and can be stacked and the cake is even. So, each layer should sit flat on each other without the cake leaning.
Add some of the lemon cream cheese frosting to a piping bag fitted with a large circular tip. Then place a dollop of lemon cream cheese frosting in the center of your cake turntable. Place the first cake layer over it. Then add a thin layer of lemon cream cheese frosting on top of the cake layer and even it out with your frosting spatula, turning the cake table as you go. With the piping bag of lemon cream cheese frosting, pipe a “boarder” layer of frosting just on the edges of the cake layer. Make sure the boarder of frosting is about ½ inch thick and 1 inch high. Then add about ¼ cup of strawberry jam onto the cake layer. Place the next cake layer over top and repeat the step.
At this point consider inserting 4-5 plastic straws through the top of the cake to reinforce it so that it won't lean.
Then place the final layer over the top and place small dollops of frosting on the outsides and top of the cake. Even out the frosting as much as possible with your frosting spatula. Then with your cake scraper, scrape the icing across the cake, turning the cake table as you go to make this as easy as possible. This layer of frosting should be very thin. This is called the ‘crumb layer’ and will ensure that the cake’s final coating of frosting is smooth and free of crumbs. Once the crumb layer of frosting has been applied, place the cake in the fridge for at least 30 minutes to allow the frosting to harden.
Once the cake has chilled in the fridge, remove it and apply the final coating of frosting. Apply generous dollops of frosting on the sides and top of the cake and smooth them out with your cake frosting spatula. Then with your cake scraper even out the frosting, turning the cake table as you go, to give you an even coating of lemon cream cheese frosting. Then take a clean frosting spatula and drag small portions of the strawberry jam across the cake. Use the cake scrapper to even out and swirl the jam into the cake. Don't over think this step, just apply and scrape! It doesn't have to be perfect.
I chose to decorate this cake simply with strawberry jam, halved strawberries and a lemon slice, but you could also easily pipe any remaining frosting onto the top edges of the cake or along the bottom. Whatever you think would look the best! Then serve the cake!