Veggie leftover samosas

Ingredients

• For the filling:
• 1 shallot, diced
• 2 tbsp vegetable oil
• 1/2 tsp fennel seed , crushed
• 1/2 tsp cumin seed
• 1/4 tsp ginger ground
• 1/2 tsp garam masala
• 1/2 tsp chillies crushed
• 3 garlic cloves, crushed
• 175 g (6 oz) leftover potatoes, cubed and cooked
• 100 g (4 oz) chopped sprouts, sliced and cooked
• 50 g (2 oz) chestnuts, chopped
• 125 ml (4 fl ozs) vegetable stock
• For the pastry:
• 225 g (8 oz) plain flour
• 1 tsp salt
• 2 tbsp oil
• 125 ml (4 fl ozs) water
• For the dip:
• 150 ml (1/2 pint) Greek yoghurt
• 1/2 tsp mint
• Vegetable oil for frying