Oven to 425F.
Pat the tenderloin dry. Rub with Dijon, then oil, herbs, garlic, salt, pepper.
Toss the vegetables in oil and salt on a large sheet pan. Lay the pork in the centre.
Roast 22 to 25 minutes. Pull it at 145F internal — pork tenderloin is unforgiving, a little pink in the centre is correct and safe.
Rest 5 minutes before slicing. Lemon over the vegetables.
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