Ingredients
Method
- Pulse flour, salt, and cold butter to fine breadcrumbs. Add egg yolk and pulse. Add cold water 1 tbsp at a time until dough just comes together. Wrap and refrigerate 30 minutes.
- Roll to 3mm thickness and line a 23cm loose-bottomed tart tin. Leave overhang. Prick base. Refrigerate 20 minutes.
- Preheat oven to 200°C / 180°C fan / Gas 6. Line with parchment and baking beans. Blind bake 15 minutes. Remove beans and parchment, bake further 8–10 minutes until dry and pale golden. Trim edges. Reduce oven to 170°C / 150°C fan / Gas 3.
- Cook bacon lardons in a dry pan until golden. Add onion, cook 5 minutes. Cool slightly.
- Whisk eggs, yolks, cream, milk, most of the Gruyère, nutmeg, salt, and pepper together.
- Scatter bacon and onion across pastry base. Pour over custard. Scatter remaining Gruyère on top.
- Bake at 170°C for 30–35 minutes until just set at edges with a gentle wobble in the centre. Rest 15–20 minutes before removing tin sides and slicing.
Notes
Keep pastry cold at every stage — chill after making and again after lining the tin.
Blind bake fully until the base looks dry and pale golden — do not rush this step.
The custard should wobble gently in the centre when done — do not overbake.
Use both whole eggs and extra yolks for a richer, silkier, more golden custard.
Season the custard generously — it needs more than you might expect.
Pastry dough and blind-baked case can both be made ahead.
Stores in the fridge for up to 3 days. Freezes well for up to 3 months.
