Preheat oven to 350 F. Melt butter in microwave.
Cut 3 lemons into half. Squeeze the juice out of the lemon.
Remove the lemon pulp using a spoon and a knife. You will get 6 lemon containers. Zest the last lemon.
Use a handheld mixer to beat eggs and sugar until creamy. Whisk in flour and melted butter. Stir gently. Add lemon zest and lemon juice and mix until combined.
Pour batter into the 6 lemon containers. Bake for around 20-25 minutes
Decoration: mix lemon juice and powdered sugar to make icing. Top each lemon cake with icing and rosemary.
Bonus: Save the leftover lemon juice and lemon zest to make lemon curd. Watch video instruction. https://www.youtube.com/watch?v=PzBCRYAnQl8
