Chocolate cake with ginger

ingredients:
200 g of dark chocolate with 60% cocoa
100 g butter
100 g flour
1 packet of yeast
4 eggs
Sugar 150 g
1 teaspoon grated fresh ginger
1 pinch of salt
method:

1. Preheat oven to 180 ° C (gas mark 6). In a saucepan, melt butter and chocolate. Remove from heat and stir in the flour and yeast.
2. In a bowl, beat the egg yolks with the sugar until the mixture whitens. Add the chocolate mixture.
3. Beat the egg whites with a pinch of salt. Incorporate them into the previous preparation. Add grated fresh ginger.
4. Pour into a cake pan lined with parchment paper (26 to 28 cm in diameter). Cook for about 30 minutes. Watch the end of the cooking spice cake with a knife: it should come out clean. Let cool before removing from pan
http://www.odelices.com/recette/gateau-au-chocolat-et-au-gingembre-r1556/