Giant potato and cauliflower filo samosa

Name: Giant potato and cauliflower filo samosa
Ingredients: 900 grams organic potatoes peeled and cubed; 15 pastry sheets; 50 milliliters oil or butter; 1 leak halved and thinly sliced; 1/2 cauliflower head washed and made into small florets; 1/2 teaspoon fresh grated ginger; 2 garlic cloves; 1/2 teaspoon coriander powder; 4 spring onions finely chopped; 1/4 teaspoon black pepper freshly ground; 1 onion finely shredded; 10 fresh curry leaves; 1 tablespoon curry powder; 1/2 teaspoon turmeric powder; 1 1/2 teaspoons Himalayan pink salt; 1-2 green or red chillies optional; 1/2 teaspoon mixed seeds cumin, mustard, fenugreek and black sesame; 2 tablespoons mango pickle to serve with