Wash and dry the ladyfingers, make sure they are bone dry before you cook. (I often wash them the night before cooking, so they can dry overnight.) Then trim the ends off, and cut the lady fingers into 2cm chunks.
Add 1 tablespoon of oil to a pan and shallow fry the ladyfingers with the lemon juice, roughly ground coriander seeds and the sliced 1/2 onion. Fry for around 5 minutes, until the onions are softened. Leave to rest whilst you make the masala.
Heat 3 tablespoons of oil in a medium sauce pan, add the finely chopped onions and brown.
Then add the garlic, ginger and stir through. Add the red chilli powder, turmeric, salt, tomatoes and finely chopped green chillies and cook through. Cook for 10 minutes, this will give enough time for the masala to come together. (Add splashes of water if the masala becomes too dry and is sticking to the pan.)
Next add the ground coriander, cumin and garam masala and stir through. Then add ladyfingers to the pan, do not stir through. (The ladyfingers will become overly soft with excess stirring). Cover the pan with the lid and turn the heat to low. Let everything cook for 10 minutes.
Finally, add the fresh coriander and green chillies sliced and serve!