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Preheat oven to 425.
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Line a baking dish with foil or parchment paper.
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Place diced celeriac root into the baking dish, and sprinkle over the dried thyme, some salt and pepper.
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Using your hands toss to coat the seasoning evenly over the celeriac root.
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Pour over the melted grass-fed butter/ghee.
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Place into the preheated oven for 40 minutes, making sure to toss and turn the diced celeriac root halfway through the roasting process.
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While the celery root is roasting in the oven, place a skillet on medium heat.
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Once hot add in the diced pancetta.
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Cook until the pancetta starts to crisp up and release its fat.
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Remove the pancetta onto a paper-lined plate, reserving the fat in the skillet.
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Add in the sliced leek and cook until just softened.
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Add in the sliced mushrooms, cook until the mushrooms and leek have both softened.
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Season with some freshly cracked pepper.
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Add the pancetta back in and lower the heat.
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Remove the roasted celeriac root from the oven and carefully add it into the pancetta mixture.
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Toss to mix everything together.
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Taste to check for seasoning and enjoy!