What is vadouvan?
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Its a french curry spice blend developed in Pondicherry (in South India). Pondicherry was the sole french colony in an otherwise british dominated Indian Subcontinent (apart from the portuguese who ruled Goa..
I believe it primarily consists of a blend of alliums (onion, garlic, Shallots) combined with other Indian Mainstay spices such as Cardamom, pepper & curry leaves (which are almost mandatory in Southern Indian cuisine)