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1
Preheat the oven to 400u00b0F. In a large saucepan, heat 1 tablespoon of the olive oil. Add the garlic and cook over moderate heat, stirring, until lightly browned, about 1 minute. Add the sausage and cook, breaking up the meat, until browned, about 8 minutes. Add the tomato puree, water, sugar, bay leaf and fennel. Season with salt and pepper and bring to a boil. Simmer over low heat until thickened, about 30 minutes. Remove the garlic, mash it to a paste and stir it back into the sauce; discard the bay leaf.
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2
Meanwhile, cook the penne in a large pot of boiling salted water until al dente. Drain the pasta and return it to the pot. Stir in the remaining 2 tablespoons of olive oil. Using a slotted spoon, add the cooked sausage to the pasta, then add 1 cup of the tomato sauce and toss to coat the penne.
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3
The baked penne can be refrigerated, covered, overnight. Re-warm before serving.
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4
Line a large colander with several layers of cheesecloth, allowing several inches of overhang. Set the colander in a large bowl. Using a slotted spoon, transfer the curds to the colander. Carefully gather the corners of the cheesecloth and close with a rubber band. Let the ricotta stand for 30 minutes, gently pressing and squeezing the cheesecloth occasionally to drain off the whey. Transfer the ricotta to a bowl and use at once, or cover and refrigerate.
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5
The fresh ricotta can be refrigerated for up to 4 days.
