Cheesy curried swede and bean pie

Name: Cheesy curried swede and bean pie
Ingredients: 600g/1lb 5oz swede, peeled and cut into 2cm/¾in chunks; 2 tbsp light olive oil; 2 leeks, finely sliced; 2 tbsp medium curry powder; 2 garlic cloves, finely chopped; 50g/1¾oz butter, plus 50g/1¾oz, melted, for brushing; 50g/1¾oz plain white flour; 750ml/1¼ pint full-fat milk; 100g/3½oz cheddar, grated; 1 tbsp Dijon mustard; 1 lemon, zest and juice; 100g/3½oz kale, torn into bite-sized pieces (stalks discarded); 400g tin haricot or butter beans; 4 sheets filo pastry; ½ tsp cumin seeds; salt and freshly ground black pepper; dressed side salad or sauerkraut, to serve