For the dal, heat the oil in a sauté pan over a medium heat. Once hot, add the cumin seeds and chilli flakes and fry for 20 seconds, or until the seeds start to pop.
Add the onion and cook for 2 to 3 minutes, or until just softened. Add the garlic, ginger, ground cumin, coriander, turmeric and salt and cook for 1 minute.
Then add the lentils, tomatoes, stock cube or pot and 400ml of water and bring to the boil. Reduce the heat and simmer for 10 to 15 minutes.
Optional - before switching the heat off add a handful of spinach and stir until wilted. We added this as we had a small amount of spinach left in a bag in the fridge.
Meanwhile, for the naan bread, put the flour, salt, and sesame seeds into a large bowl and mix well. Make a well in the centre and add the yogurt and 75ml of cold water. Mix together to form a soft dough.
Put the dough onto a lightly floured work surface and knead for 1 to 2 minutes, or until it forms a smooth dough. Divide it into 6 pieces and roll each piece into a ball. Flatten each ball gently using the palm of your hand, then roll them out to 5 mm thick circles.
Heat 1 teaspoon of the oil in a large frying pan over a medium to high heat. Add 2 of the naan circles and cook them for 1 to 2 minutes on each side, or until golden brown and puffed up. Repeat with the remaining naans, keeping the cooked naans warm in a very low oven.
Add the coriander to the dal and stir. Serve with the naan bread and some spicy mango chutney – yum, this is really delicious!