We call it yoghurt pot cake - 1 small pot natural yoghurt, 1 pot of sunflower oil, 2 pots of c/sugar, 3 pots of sr/flour, 3 eggs, 1 lemon(zest in cake, juice on top).
Pour out yoghurt and wash and dry pot. Measure dry ingredients first, then add the oil. Add eggs and zest and mix. Put in a greased/lined deep tin (8") and bake for c.1hr at 160C. When cooked pour over juice and sprinkle with a bit of c/sugar. As requested, it isn't too sweet, but nice and soft and lemony!