Beat the butter and sugar until frothy, gradually add the eggs, stir in the lemon zest. Mix flour with baking powder and stir in. Pour the batter into a loaf pan, press the cherries into the batter. Mix the sugar and cinnamon, sprinkle over the cake. Bake for 35 to 40 minutes (electric 175 degrees, convection 155 degrees, gas level 2).