Creamy Pasta with Cauliflower
Ingredients:
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1 medium head cauliflower, broken into small florets
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½ cup salted butter
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1 medium onion, diced
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1 tablespoon red pepper flakes, or to taste
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2 pints heavy cream
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1 (16 ounce) package farfalle pasta
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1 (14.5 ounce) can diced tomatoes
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1 cup grated Parmesan cheese, or more to taste