Heat oven to 200 C / Gas 6. Lightly grease baking tray.
Heat water and margarine gently in a pan until margarine melts. Bring to boil. Remove from heat, quickly add flour and salt and beat until mixture leaves sides of pan. Allow to cool slightly in a bowl.
Beat in eggs, one at a time. Divide mixture into 4 and spoon onto baking tray.
Bake 30 minutes until golden brown and risen.
Remove, immediately split open, then bake for further 5 minutes.
Serve each profiterole filled with whipped cream, berries and dusted with a little icing sugar.