In a large ovenproof skillet, melt butter over medium-high heat.
Add the potato cylinders and sear until golden brown on each side.
Pour in the broth, add thyme sprigs, and season with salt and pepper.
Transfer the skillet to the oven and bake until the potatoes are tender and have absorbed the flavorful liquid.
3. Resting and Serving:
Allow the roast beef to rest for 15 minutes before slicing.
Serve the perfectly cooked roast beef slices alongside the luxurious fondant potatoes.
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