I like this Martha Stewart recipe:
http://www.marthastewart.com/341776/lentil-soup
I also love like this Madjur Jaffrey recipe for Masoor Dal
Red Split Lentils with Cumin Seed (Masoor dal)
Recipe By : Madhur Jaffrey's Indian Cooking
Serving Size : 4 Preparation Time :0:00
Categories : Soups, Hot
Amount Measure Ingredient -- Preparation Method
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1 cup red split lentils -- sorted/rinsed/draine
4 1/3 cups water
2 slices fresh ginger root -- thinly sliced
1/2 teaspoon ground turmeric
1 teaspoon salt -- to taste
1 tablespoon olive oil
pinch ground asafetida -- optional
1 teaspoon cumin seed
1/4 teaspoon cayenne pepper
2 tablespoons fresh coriander -- chopped for garnish
1. Combine lentils and water in pot and bring to simmer. Remove anyfilm that collects on top. Add ginger and turmeric. Cover and simmer with lid ajar on low heat for 1 1/2 hrs or til lentils are tender. Stir every 5 minutes during last half hour to prevent burning. Add salt and stir. Remove ginger slices.
2. Heat oil in small pan over medium heat. When hot, put in the asafetida. A second later add in the cumin seeds. Let seeds sizzle for several seconds. A dd ground coriander and cayenne. Stir once and then pour contents of small pan into the pot of lentils all at once. Stir to mix. Garnish with fresh coriander.