1.Sift flour, salt and pepper together into a large bowl. In a jug, mix water and egg together. Gradually whisk into flour to form a smooth batter.
2.Heat oil in a deep saucepan on medium until a little batter sizzles as soon as it is added.
3.Place cornflour in a shallow dish. Lightly coat prawns in cornflour, shaking off excess. Dip prawns a few at a time into batter, draining off excess. Cook in 5 batches for 3-4 minutes. turning until golden. Transfer to a wire rack.
4.Combine honey and oil together in a frying pan. Stir on medium until combined. Add prawns, tossing until well coated. Sprinkle with sesame seeds.
To toast sesame seeds, heat a dry frying pan over medium-high heat until hot. Add sesame seeds. stirring until lightly golden. Transfer to a plate to cool.