I have no experience with this but I'll hazard a guess

like lamb
a tomato based curry
peas
potato
like a beef stew or goulash but with Indian spices

You could try adding some rice, curry, coconut milk...

Oh - easy and tasty but I am going off the top of my head so I don't have all the proportions...
This was from www.vegweb.com for other ideas - and I tweaked it a bit

Not originally a crockpot recipe, but I add rice to it and a bit more liquid and let it go for a couple of hours.

Indian Dal

    1 cup small red lentils - rinsed
1 cup rice
    1 medium onion - sliced thinly
    1 small hot pepper - chopped - don't touch your eyes!
    2 cloves garlic (or more if you like garlic)
   
    spices:
1 teaspoon cumin,
1 teaspoon coriander,
1/8 teaspoon cardamom,
1/4 teaspoon cayenne,
3/4 teaspoon garlic powder,
1/8 teaspoon ginger,
1 teaspoon salt and
1/4 teaspoon pepper
 
  4 cups water or broth
  - and your beef in chunks if you want.

Mix it all in your crockpot and let go on low for 3-4 hours - check the rice to see if it is cooked...

  - chopped spinach to add at the end

Hope that inspires!