Preheat oven to 350° F (177° C). Grease and flour one 9" round cake pan.
Mix all dry streusel ingredients in a small bowl. Using your fingers, break the butter into small pieces and mix into the streusel mixture. Set aside
Zest two lemons, and set zest aside. Juice the lemons and set juice aside.
In a small bowl, whisk dry cake ingredients: flour, baking powder, poppy seeds and salt. Set aside.
In a large bowl, rub sugar and lemon zest together with your fingers to infuse the sugar with the lemon oil. Whisk starter, oil, eggs, yogurt and lemon juice.
Mix dry mixture into wet ingredients until just incorporated. Fold in half of the cherries and pour batter into prepared pan.
Dot the remaining cherries over the top of the batter and sprinkle with streusel. Bake for 55-60 minutes or until a toothpick inserted in the center of the cake comes out dry. Let cool.