01 -
Heat butter in a large pot over medium-low heat. Cook onions with salt until caramelized, about 30-40 minutes.
02 -
Add sage to onions, transfer to bowl.
03 -
Melt remaining butter and cook spinach until wilted. Add garlic, cook 30 seconds more, remove from heat.
04 -
Heat oven to 450°F and line roasting pan with foil.
05 -
Butterfly pork tenderloin lengthwise, season with salt and pepper.
06 -
Spread cranberry sauce, leaving border. Layer spinach, onions, and goat cheese.
07 -
Roll tightly, tie with kitchen twine. Season outside with salt and pepper.
08 -
Roast 30-35 minutes until internal temp reaches 140-145°F.
09 -
Rest 10-15 minutes before slicing.