1. Khoya is usually available in Indian sweet shops, but I find it difficult to source it here. I made khoya using milk powder, as mentioned above. The quantity gave me a little more than what was required, around 120 gm.
2. I fried my jamun balls in my air fryer, that explains the light shade. I brushed each ball with little oil and laid them on an aluminium foil. I then placed it on the mesh and baked it at 180 degrees for 20 minutes. It tasted fine, though I would have preferred the deep fried version!