Seafood

Rub butter into flour, add egg white, half the yolk and vinegar with cold water, knead until smooth and rest dough for 30 minutes
Preheat oven to 350°F.
Trim green ends and finely slice spring onions
Heat oil in a pan and fry spring onions gently until soft but not browned, add chilli and garlic, then add prawns and cook until opaque
Scoop out prawns, bubble the pan juices until thickened, then return the prawns to the pan
Divide rested dough into eight balls and roll into thin circles on a floured surface
Spoon filling onto one half of each circle, sprinkle feta over the filling and fold the other half over
Trim edges, fold and crimp to seal and place empanadas on an oiled baking sheet
Mix leftover egg yolk with a splash of water and brush tops of the empanadas
Bake until golden and slightly crisp around the edges, about 30 minutes