Heat beer with 150 ml water and oil. Pour flour into a bowl and gradually stir in the liquid with a whisk. Season dough with salt and pepper. Let it swell for about 10 minutes.
In the meantime, rinse the prawns and pat them dry. Wash the chives, dab dry and cut into rings. Heat oil. Beat egg whites until stiff, fold into the dough. Pull the shrimps by the tail fin through the dough and fry in portions in hot oil for 2-3 minutes until golden brown.
Drain on kitchen paper. Sprinkle prawns with chives and serve with lemon wedges.