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Heat a skillet on medium heat. Add the oil and when warm, add the sliced and washed leeks.
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Cook for 2 - 3 minutes so they just begin to soften.
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Next, add in all the mushrooms. Cook them down pretty much all the way. This will take 6 - 8 minutes.
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A little liquid will add flavor to the dish but if there is a lot of liquid left from the mushrooms, either drain a little or turn up the heat for a minute.
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Cook the pasta and set aside.
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Place the tomatoes on a baking tray and rub with 1 - 2 tbsp of the oil and kosher salt and pepper.
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Roast at 350 degrees for 10 - 12 minutes. Set aside.
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To assemble, pour the pasta into the mushroom and leeks. Next, add the cauliflower sauce (You will probably only need about one-third of the mixture. Mix well. Finish by adding in the roasted tomatoes. Mix gently. Garnish and serve!