coffee syrup cake

Unbelievably moist and chewy candy-like cake! This is an unforgettable flavour.
Ingredients
185g unsalted butter
185g caster sugar
3 eggs, separated
1 teaspoon lemon zest
250g sour cream
60g plain yoghurt
235g self-raising flour
25g ground almonds
Syrup:
250ml strong coffee
125g caster sugar
2 tbsp cognac
Source Link: http://collectingmemoriess.blogspot.com/2011/11/coffee-syrup-cake.html