Apple Crumble Brioche Cake

Ingredients

• 2kg Granny Smiths or similar tart cooking apple
• 100g caster sugar
• 200g water
• 60g unsalted butter
• 225g full cream milk
• 15g dry yeast
• 130g caster sugar
• 4 small eggs…room temperature or slightly warmed in hot water
• 550g + 1 tablespoon strong flour
• 170g unsalted butter…melted but not hot
• 300g strong flour
• 250g caster sugar
• 188g butter cut into small cubes
• 100g roasted chopped walnuts or almonds…optional