Great Recipes - Onion and Gruyere Tart Recipe

  
 

Onion and Gruyere Tart Recipe

 

Ingredients

  • 175g/6 oz plain flour

  • pinch of salt

  • 75g/3 oz butter, diced

  • 1 egg yolk

For the filling

  • 50g/2 oz butter

  • 450g/1 lb onions, thinly sliced

  • 15-30ml/1-2 tbsp wholegrain mustard

  • 2 eggs, plus 1 egg yolk

  • 300ml/1/2 pint double cream

  • 75g/3 oz grated Gruyere cheese

  • pinch of freshly grated nutmeg

  • salt and ground black pepper

Serves 4

Method:

  1. To make the pastry, sift the flour and salt into a bowl. Add the butter and rub into the flour with your fingertips until the mixture resembles fine breadcrumbs. Add the egg yolk and 15ml/1 tbsp cold water and mix to firm dough. Chill in the fridge for 30 minutes.

  2. Preheat the oven to 200C. Knead the pastry, then roll it out on a lightly floured work surface and use to line a 23cm/9 in loose-based flan tin. Prick the base all over with baking beans.

  3. Bake the pastry case blind for 15 minutes. Remove the paper and beans and bake for a further 10-15 minutes, until the pastry case is crisp.

  4. Meanwhile, melt the butter in a saucepan, add the onions, cover with a tight-fitting lid and cook for 20 minutes, stirring occasionally, until golden.

  5. Reduce the oven temperature to 180C. Spread the pastry case with mustard and top with the onions.

  6. Mix together the eggs, egg yolk, cream, cheese, nutmeg and seasoning. Pour over the onions. Bake for 30-35 minutes, until golden. Serve warm.