I seared the tenderloin before wrapping in pastry. Every recipe I've seen is using a 2.5 lb tenderloin, cooking at a low temp for approx. 20-25 min. My Wellington is 5.5 lb, not sure what temp to use or approx time for cooking to reach medium.
Hi Henry, one option would be to cut it in half so you have two pieces that are each 2.75 lbs, then cook each as you've seen instructed. Otherwise, cook it as one piece and I'd stick to the same temperature (although many of the recipes that I've read roast it at 425 F) and plan on 10 minutes per pound. Have a meat thermometer handy and keep checking the meat (you'll want the center to be 125 F for medium rare). The main thing you don't want to do is to overcook it so if you keep an eye on it, your tenderloin should be fine.
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I thought you had to brown the tenderloin first. There's another way?
Made it once and it was so rich! Loved it but still very rich.