Cheese and onion bake (Greggs-style)

Ingredients

• 1 sheet ready-rolled puff pastry (320 g)
• 1 egg, beaten
• 2 onions, thinly sliced
• 30 g butter
• 1 tbsp plain flour
• 150 ml whole milk
• 200 g mature cheddar, grated
• 1 tsp Dijon mustard
• Pinch of nutmeg
• Salt and pepper

Method

1. Melt butter in a pan, soften onions for 10 minutes until golden.
2. Stir in flour, cook 1 minute. Pour in milk, whisk until smooth. Simmer 2 minutes.
3. Off the heat, stir in cheddar, mustard, nutmeg. Season. Cool.
4. Roll out pastry to a 25 × 30 cm rectangle. Cut into 4 rectangles.
5. Spoon cheese filling onto one half, brush edges with egg, fold over and seal with a fork.
6. Brush tops with egg. Bake at 200°C for 20-25 minutes until deeply golden.
7. Serve warm.