To make the cake : preheat your oven to 180 C / 350 F. Line the bottom of a 8 inch pan or two 6 inch pans with parchment paper. Or you can grease and flour the bottoms. Beat the eggs until foamy.Then add the sugar and vanilla and beat until the eggs triple in volume . Sift in the flour and fold gently until all the flour is incorporated. Immediately pour the batter into prepared pan(s) and bake for 22-26 minutes until the top springs back when touched and a toothpick inserted comes out clean. Cool in pan for 5 minutes , remove and cool completely.
To make the syrup: in a saucepan , bring the water and sugar to a boil, then simmer for about 10 minutes. Remove from heat, mix in the extract. Cool to room temperature before using.
To make the raspberry filling : In a saucepan , heat together the berries ,sugar and lime juice for a few minutes, stirring occasionally. Once the fruit breaks down, sieve this to remove the seeds . Add a half cup water to this strained fruit mixture and reheat. Bring to boil, add the cornflour and simmer for 5-6 minutes while stirring until it thickens. Cool to room temperature before using.
To make the whipped cream : whip together the chilled cream, extract , sugar and food colouring if using with a whisk or electric mixer until stiff peaks are achieved ( if you overturn the bowl, the cream should not move). Keep chilled until using.
To assemble: slice each cake into two layers if you used two six inch pans or three if you used one 8 inch pan. Place one layer on a cake board or serving plate. Brush some syrup on the top and sides . Spread about 2-3 tablespoons of the filling on the layer , leaving about a 1/4 inch edge free. Pipe a circle of whipped cream on this edge(this acts as a dam to prevent the filling from coming out on your frosting). Place another layer on top , press down gently. Soak and fill the second and third layers , place the final layer on top. Soak with syrup and spread whipped cream on the top and sides. Smoothen using a spatula . Chill in freezer for 15 minutes. Spread another layer of whipped cream on top if you wish for a neater finish. Pipe / decorate as you wish.