I've been making this very cake for Christmas for about 6-7 years now, and it's still one of the favourites with friends and family. I made it again for a friend's birthday party last weekend, tuning the recipe a bit - reducing the amount of sugar (you could use even less, I bet), and replacing melted butter with mild-tasting oil in the batter. There are two things to keep in mind. First, the cake is eggless (so suitable for people with egg allergies!) and the raising agent is baking soda/bicarbonate of soda. As with other similar batters, it's important to bake the cake straight away after mixing the batter - the baking soda starts to react with acid in the batter (kefir in this case) within 15-20 minutes, and if you don't bake the cake during that time, you'll end up with a very flat christmas cake :( Secondly, you could use a much larger cake sheet, but i like this in the specified size - the cake will be about 4 cm in height, which is good for me. Soft Ginge...