Vadouvan is an Indian Spice Blend made with shallots and garlic. The mixture is pounded, rolled into a ball and then dried for a few days and then crushed.
Most Vadouvam consist of onion (or something onion-like), garlic, cumin seeds, mustard seeds, fenugreek and oil. Sometimes a few other spices are added.
That’s basically WTFork Vadouvan is.