Preheat oven to 180°C. Add the instant coffee to 1 cup (250ml) of boiling water and stir well. Into a bowl, pour the coffee over the dates and soak overnight. Stir in the flour. Spoon the mixture into a paper lined 20cm springform cake pan, and bake for 45 minutes. Remove and cool, when ready to serve pile high with fresh, seasonal raspberries.