I tried this recipe from jey's blog..I usually make tomato chutney using chana dal .This recipe is also similar to that but she used fried gram dal and garlic which made me to give a try. It was very nice with idli. . As i had less onions in my pantry , i used more tomatoes & less onion. The actual recipe suggested to use equal number of onions & tomatoes.Try any based on ur liking.