Apple custard crumble cake

Ingredients

• 3 large pink lady apples, peeled, cored, sliced thickly
• 2 tsp Orgran No Egg™ Egg Replacer
• 4 tbsp water
• 1 cup caster sugar
• 150 gram butter, softened
• 1 3/4 cup Orgran Gluten-Free Self-Raising Flour
• 2 tablespoon Orgran Instant Custard Mix
• 2/3 cup milk
• Crumble
• 3/4 cup Orgran All Purpose Plain Gluten-Free Flour
• 3/4 cup brown sugar
• 3/4 cup shredded coconut
• 100 gram butter, softened