Fill a large pan one-third full with sunflower oil and place over a medium heat. Whilst the oil is heating, in a mixing bowl beat together the egg, half the water, the flour, salt and sugar and beat until combined.
Dip the flowers into the batter, shaking off any excess, and place into the hot oil and fry for a few minutes, until golden. Remove from the oil and place on a piece of kitchen paper to drain.
Dust in icing sugar and serve immediately.