Initially I used to think that dal and dal tadka are two completely different dishes. Later I figured out that 'tadka' in hindi means 'tempering'. Now, don't roll your eyes! How do I know - I grew up in Kerala and I was not paying attention in the class when our hindi teacher covered that part :) And, nobody in Bollywood movies talk about tadka either hmm...DH grew up in Gujarat and he loves to have dal with rice or chapathi.
Recipe courtesy: Phanitha's Kitchenette