There are few items that go well together and hence make an excellent combination when prepared hand in hand..listing some of the combination items that i am aware of..
1. Vathal Kuzhambu Sadham with Avial / Potato Curry & Sutta Appalam
2. More Kuzhambu with Paruppu Usili
3. Vengaya Sambhar with Potato urappu curry
5. Paruppu Thogayal & Jeera Milagu Rasam