• 

  organic lemon thinly peeled (peel only, no pith)

  ¼
• 

  sugar

  3 ½ oz
• 

  unsalted butter soft, cut into pieces

  3 ½ oz
• 

  homemade vanilla sugar (see Tip)

  2 oz
• 

  large eggs

  2
• 

  whole milk

  2 oz
• 

  pastry flour

  7 oz
• 

  corn starch

  2 oz
• 

  baking powder

  2 tsp

Icing

• 

  confectioners sugar

  14 oz
• 

  water plus extra to thin, if necessary

  2 oz
• 

  freshly squeezed lemon juice

  1 oz
• 

  natural vanilla extract

  ½ tsp
• 

  Dutch-processed cocoa powder

  1 oz