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To make the shortbread preheat the oven to 180c/ gas mark 4. Cream the butter and sugar together and add the vanilla. Beat until smooth. Add the flour and salt and press onto the bottom of a greased or lined tin. Bake for 20-25 minutes until shortbread is pale golden. Set aside to cool.
While the shortbread is cooling blend the olives in a food processor to a fine paste, melt the caster sugar and 50g of glucose syrup in a saucepan over a low heat, then increase the heat and continue to cook until the caramel is golden brown. Remove from the heat and whisk in the olive paste. Leave to cool then spoon onto the shortbread. Allow to set at room temperature for at least 20 minutes.
When the caramel has set, melt the chocolate in the microwave with the butter and spread it in an even layer over the caramel.
Leave it out at room temperature to harden little. Before the chocolate has completely set cut it into squares or your desired shape and enjoy!