Chop the garlic and ginger, cut the spring onions into rings, and dice the paprika. Roast the curry powder and mustard seeds in a hot pot, add oil, garlic and ginger. Fry briefly, then add the lentils and diced paprika and fry briefly.
Deglaze with the vegetable stock and bring to the boil. Add tomatoes and coconut milk and simmer over low heat for 15-20 minutes until the lentils are soft. Mix in the spring onions and season with salt and pepper.