Impress your guests with juicy Beef Wellington with red wine sauce on the side. Perfectly tender beef is wrapped up in puff pastry like a big buttery hug!
Heat the butter and oil together in a large skillet over med/high heat until hot but not smoking. Season the beef tenderloin with kosher salt and pepper.
If there are blackened bits in your pan, use a paper towel to remove them & add a little more butter/oil. Otherwise add the shallots, garlic, & mushrooms directly to the pan & season with salt & pepper.