These are a bunch of idlis with the sambar (red gravy) alongside. They are basically a steamed rice cake that you use to soak up a savory sauce, usually of vegetables.
You use these pans to make them. But I don't have these pans, so I made up my own version. Thanks to a friend, I have a large soup pot with a steamer basket. I used some small dessert bowls and mixed up the batter (from a mix I had). I could only cook one at a time because of the sizing, but it was worth it! (Well, except for the one that tasted burnt because I let all the water boil away in my pot until the fire alarm went off...)
Here is a very informative article about them.
It was delicious and perfect for our achey bodies.