The art here is really spot on. Their first meeting has been featured many times already, usually in flashbacks of course. My memory, or preferred version, of their meeting is when Batman finds to his disbelief that one of the batmobile wheels was missing. As he’s contemplating on the absurdity of the situation, Jason Todd comes back to finish the job and then the two of them meet.
From – Red Hood And The Outlaws – Rebirth #1