• 

  unsalted butter to grease

Crumble topping

• 

  blanched almond

  100 g
• 

  plain flour (see Tips)

  100 g
• 

  unsalted butter chilled, diced

  100 g
• 

  white sugar

  60 g

Apple layer

• 

  Granny Smith apples peeled, cored and sliced (0.5 cm - see Tips)

  400 g
• 

  freshly squeezed lemon juice

  40 g
• 

  white sugar

  80 g

Cake

• 

  white sugar

  150 g
• 

  unsalted butter cut into pieces

  150 g
• 

  eggs

  3
• 

  self-raising flour (see Tips)

  150 g