Aloo bun chat

Ingredients

• 3 tbsp plain flour
• 1 tsp chilli powder
• salt
• ½ tsp garam masala
• ½ tsp turmeric
• 2 spring onions, finely sliced
• 1 tbsp mayonnaise
• 1 free-range egg, beaten
• vegetable oil, for shallow frying
• 500g/1lb 2oz ready-made mashed potato
• handful fresh coriander, finely chopped
• 1 tsp coarsely ground, toasted cumin seeds
• 125g/4½oz raw cashew nuts, soaked in water for 30 minutes and drained
• 125g/4½oz golden sultanas, soaked in water for 30 minutes and drained
• 60g/2¼oz fresh coriander
• 1 small green chilli, roughly chopped
• 75ml/2½fl oz lemon juice
• 4 soft white bread or brioche rolls, split
• 4 tbsp tamarind chutney