To make the prawn stuffing, in a small blender, combine the prawns, garlic, sugar, black pepper, fish sauce, lime and lime zest. Blitz on pulse a few times to form a coarse paste, marinate in the fridge for 30–60 minutes. Then let come to room temperature for about 20 minutes.
Meanwhile, mix together all the dressing ingredients. On a griddle pan, grill the courgettes until soft and charred.
Mix the mint and garlic chives into the prawn stuffing. Stuff each courgette flower with 2 teaspoons of prawn mixture, leaving some room at the top to twist the flowers closed.
To make the batter, combine all the dry ingredients. Add the cold sparkling water a little at a time – the amount you need will vary – and stir to combine to a smooth double cream texture, breaking up any lumps. Then add the ice cubes.
To fry the courgette flowers, heat a deep fat fryer or oil in a deep pan to 140°C (280°F) or until it fizzes with small bubbles when you put a pair of wooden chopsticks into the oil.
Cook the flowers a few at a time so you don’t overcrowd the fryer basket or pan. Dip the flowers in the batter, shake off any excess, then fry on a medium–high heat for about 2–3 minutes until golden brown, or until the filling is cooked. It should fry with lots of bubbles, slowly turning golden. Rest and drain on kitchen paper. Repeat with the other flowers.