Begin by washing your lentils under cold water before adding them to the saucepan and adding the 4 cups of water.
Add the turmeric and bay leaf and bring to a boil, then reduce to a gentle simmer.
Whilst the lentils simmer, prepare the garlic ginger paste if you are making your own.
Crush equal amounts of garlic and peeled ginger with a little vegetable oil in a pestle and mortar until a paste forms. Use around 2 large cloves and a piece of ginger around the size of your thumb to make the paste.
Dice the onion and finely chop the green chillies.
Add a little water to a tablespoon of tomato puree to make a quick passata
Once the lentils are cooked down and getting creamy, its time to cook the tadka.
Over medium high heat, fry the diced onions until turning golden at the edges
Add the spices and chilli and cook for a minute or so, then add the garlic ginger paste. Cook until the spluttering stops, around a minute or so.
Add the passata and cook out for a minute or two
Remove from the heat and add the tadka to the dal
Mix thoroughly then season the lentils to taste with salt and pepper, finishing off with some chopped coriander