Heat the oil and add the fennel seed and turnip chunks. Cook over medium heat for about 5 minutes.
Add the salt, turmeric, and cumin. Stir until every piece of turnip is coated with spice. Continue to cook over very low heat for about 10 minutes - stirring occasionally.
Add the water - I prefer my curry less soupy, so I used about a half cup of water. If you like a soupier consistency add the full cup. Cook until heated through - another 3 or 4 minutes.