Step 4: Give that Sucker a Bath
Preheat your immersion circulator to 135F for perfectly medium rare meat. Once it's hot, drop in your tri-tip and set your timer for 90 minutes (for a two pound roast). The beauty of this cooking method is that the meat will never overcook. However, I would not recommend cooking the roast for more than three hours because the connective tissue in the meat begins to break down and become a bit mushy.