I really love to work with a frozen cake, so I usually make the cake ahead of time and freeze it before filling and frosting it.
Place one layer on your cake platter, right side up. Spread lemon curd over the top of this layer. Refrigerate for about 20 minutes so that the lemon curds stiffens up a bit. Then, spread a layer of buttercream frosting right over the lemon curd. Place the second layer, this time with the bottom side up, right over the filling. Press down on the top layer slightly to flatten and even out the cake.
It’s now time to frost the entire cake with a crumb coat of frosting. To do this and not get crumbs into your frosting, separate out about 1/3 of the frosting into a separate bowl. Use this for the crumb coat. This coat doesn't have to be perfect, but should cover the cake. To make this frosting smooth, use a bench scraper along the sides of the cake. Refrigerate crumb-coated cake for at least 30 minutes, or put it into the freezer for about 15 minutes before spreading your final coat of frosting. This just makes it so much easier to spread the frosting.
Now, spread the entire cake with the final coat of buttercream frosting using an off-set spatula. Once the cake is completely frosted you can either refrigerate it or go about decorating it, depending upon when you want to serve it. You can frost this cake a few days ahead of time and keep it in an air-tight cake carrier, or you can frost, decorate it and serve it all at one time. Be sure to add the flowers just before serving so they stay fresh and won’t wilt.
Using the fruit, edible flowers, and herbs you've selecte, (we like to use mint for the green leaves), arrange them on top of the cake and along the bottom edges of the cake platter, making a beautiful English garden effect. When ready to serve, your guests can decide if they want to eat any of the flowers. I usually don’t, but some people may like to!