Preheat the oven to 180C.
Prepare one large or two small silicon cake tins (you can use butterfly, heart, flower, teddy bear, egg etc shaped tins).
In a large bowl, mix together the flour and the poppy seeds.
In another bowl beat the eggs with the sugar until you get a light cream. Add the lemon zest & juice, oil, milk & vanilla. Mix well.
Add this mixture to the flour and mix gently until you get a smooth batter. If the batter is too thick, add some more milk. (But the batter should not be runny either!).
Fill the silicon cases with the batter and put them on a flat baking tray.
Bake for 20-25 minutes until the cake is golden and springy when you touch it. Test it with a skewer.
Cool the cakes in the silicon cases, then transfer them to a wire rack. When completely cooled, decorate them to your liking.