Penne with Tomato Prosciutto Sauce
['2 tablespoons olive oil', '1 large red onion, finely chopped (2 cups)', '2 garlic cloves, finely chopped', '6 ounces thinly sliced fine-quality prosciutto, such as Prosciutto di Parma, finely chopped and separated into pieces (1 1/2 cups)', '2 (28-ounce) cans Italian plum tomatoes in juice, drained, reserving juice, and finely chopped', '1 teaspoon sugar', '1 pound penne rigate', 'Accompaniment: Parmigiano-Reggiano (shavings or finely grated )']
Heat oil in a wide heavy medium pot over medium-high heat until it shimmers, then sauté onion until golden, about 10 minutes. Add garlic and sauté until golden, about 1 minute. Add prosciutto and sauté until golden, about 4 minutes. Add tomatoes with reserved juice, sugar, and 1/4 teaspoon each of salt and pepper and simmer, uncovered, stirring occasionally, until thickened, 45 minutes to 1 hour. Cool, uncovered, then chill, covered, at least 8 hours (to allow flavors to develop).
Cook penne in a pasta pot of boiling salted water (3 tablespoons salt for 6 quarts water) until al dente. Drain well.
While pasta cooks, reheat sauce over medium heat.
Toss pasta with some of sauce in a serving bowl and serve remaining sauce on the side.
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