Poppy seed strudel with crumble topping

Name: Poppy seed strudel with crumble topping
Prep time: 30 min
Cook time: 3 h 15 min
Total time: 3 h 15 min
Yield: 16 portions
Ingredients: 140 g poppy seeds; 300 g boiling water; 20 g raw almonds; 20 g walnuts; 50 g white sugar; 70 g honey; 40 g sultanas; 10 g unsalted butter; 50 g milk; 50 g mixed peel; ½ tsp natural almond extract; ¼ tsp ground cinnamon; ½ orange; 20 g orange juice; ½ tsp sea salt; 2 tbsp rum; 120 g milk; 1 ½ tsp dried instant yeast; 125 g unsalted butter; 20 g white sugar; 1 egg; 250 g plain flour; 1 pinch sea salt; cold water; 125 g unsalted butter; 170 g plain flour; 70 g white sugar; 70 g icing sugar; ¼ tsp baking powder; ½ tsp natural vanilla extract