1. Slice the onions and soften them in the butter until translucent.
2. Sprinkle with flour, pour in the milk and cook into a thick sauce.
3. Stir in the grated cheddar, season, then cool.
4. Line a pie dish with puff pastry.
5. Fill with the cheese and onion mixture, cover with pastry and brush with egg.
6. Bake at 190°C until golden.
Tip: A vegetarian classic – mature cheddar gives it real character.
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