Pastry to use : puff pastry.

500 gr [1 lb] brown onions

2 egg yolks

6 Tbsp heavy cream

40 gr butter

3 Tbsps olive oil.

Peal and mince the onions ,put them in a non-stick pan with the butter and the olive oil ,add salt & pepper.

Heat at medium flame, and fry them lightly for 15 minutes (they should get golden).

Preheat oven at 220°C / 425°F ; butter the dish and line the puff pastry .

In a salad bowl, beat the egg yolks, then add the heavy cream. Mix with the onions.

Fill the pastry with the onion preparation and bake for 30 minutes.

Serve hot.