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1
Preheat oven to 350u00b0F.
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2
In 12-inch skillet, heat 2 tablespoons olive oil over medium-high heat until shimmering. Add onion and cook briefly until beginning to soften, about 1 minute, then add spinach or other greens along with 1/4 teaspoon each salt and pepper. Cover and cook until wilted, 2-10 minutes depending on ingredient, adding water if necessary to keep moist. Remove lid and cook further, if necessary, until all moisture is evaporated.
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3
Arrange half spinach mixture down center of pork tenderloin, top with cheese, and finish again with spinach. Fold in sides and roll tenderloin carefully to distribute filling evenly. Using butcher's twine or 2 1-inch strips of aluminum foil, wrap tenderloin at both ends to secure filling.
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4
Heat remaining oil in ovenproof skillet over medium heat until shimmering. Season pork with remaining salt and pepper and brown pork on all sides, turning carefully, about 5 minutes. If using foil, remove, then transfer to oven and bake 10 minutes, until pork is cooked but slightly pink in center. Remove and transfer pork to plate to rest.
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5
Add tomatoes to skillet along with a pinch of salt and 2 tablespoons of water and saute over high heat until just softened, 2-3 minutes, and pan drippings are reconstituted. Slice tenderloin and arrange tomatoes around it. Serve immediately.
