Then there is wiki's version
Rogan josh (or roghan josh) is an aromatic lamb dish of Persian origin, which is one of the signature recipes of Kashmiri cuisine. Rogan (

?) means "clarified butter"[1] or "fat" in Persian, while josh (

) means "heat, hot, boiling, or passionate".[2] Rogan josh thus means cooked in oil at intense heat. Another interpretation of the name rogan josh is derived from the word rogan meaning "red color" (the same Indo-European root that is the source of the French "rouge" and the Spanish "rojo") and josh meaning passion or heat.
Rogan josh was brought to Kashmir by the Mughals, whose cuisine was in turn influenced by Persian cuisine. The unrelenting summer heat of the Indian plains took the Mughals frequently to Kashmir, which has a cooler climate because of its altitude
best, Rich