Cornish cowboy pasties

Name: Cornish cowboy pasties
Cook time: 1 h 30 min
Total time: 1 h 30 min
Cuisine: American
Ingredients: 250 g butter; 300 ml hot water; 500 g plain flour plus extra for dusting; 1 large free-range egg beaten; 1 handful medium ground cornmeal or polenta; 1 red onion peeled and finely chopped; olive oil; 4 skinless, boneless higher-welfare chicken thighs cut into 2cm dice; ½ small butternut squash (approximately 250g) peeled and cut into 1cm chunks; 1 carrot peeled and roughly chopped; 1 medium potato peeled and cut into 1cm chunks; 6 sprigs fresh sage or thyme leaves picked and chopped; nutmeg; 300 ml organic chicken stock; 2 tablespoons Worcestershire sauce; 1 tablespoon plain flour