This is an adaptation from a recipe in the beautiful cake porn book "Cake Days" by the Hummingbird Bakery. While I'm sure that the original recipe was perfect already, I am pathologically unable to stick to instructions. It's one of my many quirks.
7oz self raising flour
1/2 tsp baking powder
7oz golden caster sugar
3 medium eggs (I don't need to remind you to use free range, do I?)
1 tsp vanilla extract
5oz blueberries dusted with 1 tbs flour
1oz quark, beaten to soften
The method is the same as a basic sponge. Cream together the marge and sugar (purists would probably do this with a wooden spoon and elbow grease but I'm far too lazy for that) until light and fluffy, then beat in the eggs one at a time. Sift in about half of the flour and baking powder, stir well, then fold in the rest. Fold through the quark, then finally the blueberries. Bung in your prepared tin of choice (I used a loaf tin, but had a bit of spare mixture so made half a dozen cupcakes out of the remainder) and let it bake at about 180 C until risen to perfection and dotted with exploded purpley goo.
The slightely higher than usual egg-flour ratio along with the quark makes this cake so soft and moist it really doesn't need any frosting, but since I had half a tub of quark in the fridge I thought I'd play around. A large dollop beaten with a little icing sugar and a few drops of lemon oil (juice would slacken the frosting too much) makes a lovely tangy topping. It would be seriously good on carrot cake too.