Preheat oven to 350°F

Trim excess fat from pork and pat dry with paper towel. Season with salt and pepper. Dust with flour, shaking off any excess

In a large skillet, heat 1-2 tablespoons of vegetable oil over med-high heat. Sear pork in oil' rotating to brown all sides. Transfer to baking dish just large enough to fit tenderloin.

In a bowl, stir together Russian salad dressing, honey and onion soup mix. Pour evenly over tenderloin, rolling the meat to coat on all sides. Cover with aluminum foil.

Bake, covered, in preheated oven for 30 minutes, basting with glaze every 10 minutes. Remove foil and continue baking another 30 minutes, or until pork is no longer pink in the center.