Boil the lentils in ½ cup of water till they turn soft and mash it well. To this, add the crushed garlic, red chilli powder, turmeric powder, Thai green chilli and cream and mix well. Let it simmer until the dal thickens.
Meanwhile, heat the butter in a small pan and add the cumin seeds. Once they start crackling, add the onions and garlic to it. Sauté it well.
Pour this mixture on to the dal and add enough salt.
Switch off heat and squeeze half the lime over it. Drizzle the 2 tbsp of cream over it as garnish once moved to a serving dish.