Lay a sheet of filo pastry lengthways out on the work surface and brush the top half of it generously with melted butter. Fold the lower half back to cover the butter, butter the top of that as well.
Cut the filo into 5cm strips across the width of the sheets of filo and then the same across the length to make 12 x 5cm squares
Place one square on top of another to make a star shape
Place in mini muffin tins and cook in the oven for 5-10 minutes until golden brown.
To make the sauce, combine all the ingredients except for the coriander in a jam jar and shake well. Chop the coriander stalks up to the leaves and add that to the sauce. Reserve the leaves for garnish
Coat the prawns with the sauce. Place one prawn in each filo cup and top with a reserved coriander leaf.