Heat oil in a pan and add sliced onions, sauté until golden brown.
Add ginger-garlic paste and green chillies, cook for a minute.
Stir in korma masala and cook for another minute.
Add cubed tofu and sauté gently for 5 minutes.
Pour in coconut milk and cashew paste, mix well.
Simmer for 15 minutes, stirring occasionally.
Season with salt and lemon juice.
Garnish with fresh coriander leaves before serving.