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Bring a medium pot of salted water to boil and cook pasta to directions on box
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While water heats cook pancetta in a sauce pan on medium heat until crispy
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Scoop out pancetta and set on a paper towel, add butter to pan (still on medium heat), stirring continuously as butter bubbles and become frothy. Add chopped sage and 'fry' it in butter until crispy (60 seconds or so) then take off heat
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Pasta water should be ready now. Cook to package instructions stirring frequently
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While pasta cooks heat 1 3/4 cups sauce (or more if you like) and shave parmesan cheese with a 'y' peeler
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When pasta is al dente, pour into a colander (do not rinse), tap colander to get out excess water
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Add pasta back to pot and pour in heated sauce, stir until well combined