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In a pot set to medium, add sausage and cook stirring to break up into small bits until almost all pink is gone. Add garlic, scallions, leeks, and shallots, and cook for 4-6 minutes until vegetables soften.
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Add stock, cream, spaghetti, crushed red pepper, and 1/2 tsp of salt and bring to a boil. Partially cover, reduce heat to low and cook, stirring occasionally, for 5 minutes.
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Add asparagus and peas. Cook, stirring occasionally, for 4-5 minutes until added vegetables are tender yet crisp and pasta is tender.
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Remove from heat. Stir in chives and 1/4 cup of cheese. Season to taste.
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Serve with additional cheese on side.