Blueberry Sponge

This week's recipe is completely off subject, but due to request, I had to include this delicious blueberry sponge that I have made for the boys in the shop when they are working hard on a Saturday. It is again a recipe taken and adapted from Jamie Oliver's Jamie's Italy, one of my favourite cookbooks that I absolutely love, as much for its pictures and stories of Italian life as for its tasty recipes.

Ingredients 
butter for preparing the cake tin
4 large eggs (all of Andrew's eggs are free range from the local Gate Farm, Suffolk)
270g soft golden caster sugar
180g unsalted butter, melted
115ml extra virgin olive oil
155ml milk
1 teaspoon pure vanilla extract
400g plain flour
1.5 teaspoons of baking powder
a pinch of sea salt
zest of 1 lemon grated
zest of 1 orange grated
one large punnet of fresh blueberries (jamie uses 600g but I have found that 350g is plenty)


Preheat the oven to 175C | Generously butter a 25cm/9.5 inch cake tin, line the base with greaseproof paper, and set aside | Either by hand or in the bowl of an electric mixer fitted with a whisk, beat the eggs and sugar for about 10 minutes until thick and pale yellow | Add the butter, extra virgin olive oil, milk and vanilla seeds, and mix well | Sift in the flour, baking powder and salt | Add the lemon and orange zest and stir with a wooden spoon until thoroughly blended | Set aside for 10 minutes to allow the flour to absorb the liquid.

Stir about a quarter of your blueberries or grapes into the batter, spoon it into your prepared cake tin and smooth out the top with a spatula | Place the cake tin in the centre of your preheated over and bake for 15 minutes, the remove it from the oven and scatter the remaining blueberries over the top | Gently push them down into the cake, then return it to the oven for another 30 to 40 minutes until the top is a deep golden brown and the cake feels quite firm | Put the tin on a rack to cool | After ten minutes run a knife along the sides of the pan and turn out your cake.