First we take Manhattan and then Berlin? Or was it Seattle? At any rate, the US online retail giant began delivering fresh food this week in the German capital with its 3.5 million inhabitants.For an annual fee of €49 Amazon Prime customers can choose from a programme of around 20,000 lines, ranging from batteries to high-definition TVs. This includes an initial assortment of over 4,700 food & drink items with more than 100 deep frozen and 200 dairy products as well as around 60 fruit & veg lines.This week's move provides a clear indication that Amazon intends to intensify its competition with local retailers. Grocers beware?