Place the mint and coriander leaves in the mixing bowl then chop 3 seconds/speed 5. Transfer the chopped leaves to a small bowl and set aside.
Place a large bowl on the mixing bowl lid and weigh in the lamb. Remove the bowl from the lid, add the garam masala then stir well.
Heat 2 tbsp of the vegetable oil in a frying pan over a high heat. Fry the lamb in batches for 2 to 3 minutes until browned all over. Transfer to a plate and set aside.
Place the onions and garlic in the mixing bowl then chop 5 seconds/speed 5. Scrape down the sides of the mixing bowl with the spatula.
Add 30g of the vegetable oil and the butternut squash then cook 8 minutes /100°C/reverse/slow speed (spoon symbol).
Add the lentils, curry paste, tamarind paste, sugar, hot water, stock cube and reserved lamb and juices then, without the measuring cup, cook 30 minutes /98°C/reverse/slow speed (spoon symbol).
Then add the salt, pepper, reserved chopped herbs and lemon juice then stir well with the spatula. Adjust seasoning if desired, then serve with your choice of rice, Indian bread and side dishes. Most recently we enjoyed ours with garlic and coriander naan, and rice.