Heat oil in a frying pan over medium heat. Add garlic. Cook for 1 minute. Increase heat to high. Add mince. Cook, stirring with a wooden spoon, for 5 minutes. Stir in onion, potato, sweet chilli, lemon juice, fish sauce and sugar. Cook for 2 minutes. Remove from heat. Cool completely. Stir in coriander.
Preheat oven to 200°C. Cut two 14cm rounds from each pastry sheet. Spoon 1/4 cup mince mixture onto each round. Brush edges with water. Pinch pastry together to enclose filling. Press edges to seal and form frills. Stand pasties, frill side up, on a baking tray.
Brush pasties with egg. Bake for 30 minutes or until golden. Serve with tomato chutney.
Recipe courtesy of www.taste.com.au