Onion and Gruyère Tart
Annabel Karmel's favourite savoury tart, this recipe from her Family Cookbook is a delicious mix of slowly caramelised onions and Gruyère cheese.
From the book
This is my favourite savoury tart; a delicious mix of slowly caramelised onions and Gruyère cheese. It’s easy to make the Parmesan pastry with a food processor.
|plain ﬂour, plus extra for dusting
|medium egg, beaten
|For the filling:
|a knob of butter
|onions, thinly sliced
|Gruyère cheese, grated
|Parmesan cheese, grated
|salt and black pepper
You will need a 24–25cm (9½–10in) deep round loose bottom tart tin.
1 Line a 24–25cm (9½–10in) deep round loose bottom tart tin.
2 To make the pastry, put the ﬂour, butter and Parmesan in a food processor. Whizz until it looks like breadcrumbs. Add the egg and 1 tablespoon of water and whizz until the mixture forms a ball. Roll out on a clean, lightly ﬂoured work surface and line the base and sides of the ﬂan tin with the pastry. Set aside to chill in the fridge for 30–35 minutes.
3 Preheat the oven to 220°C/425°F/Gas7. Prick the base of the ﬂan pastry and line with baking paper and then baking beans. Blind bake the pastry for 10 minutes. Remove the beans and bake for a further 8–10 minutes until lightly golden, then place the pastry case on a baking sheet.
4To make the ﬁlling, melt the butter and olive oil in a frying pan. Add the onions and fryover a medium– high heat for 5 minutes. Cover with a lid and gently simmer for 20 minutes until soft and golden brown. Spread onto the base of the tart.
5 Beat the eggs in a bowl. Add the cream and milk and season. Add the Gruyère,then pour into the case.Sprinkle with the Parmesan.
6 Reduce the oven to 180°C/350°F/Gas4. Bake for about 30–35 minutes until lightly golden on top and set in the middle.