Heat the olive oil in a medium saucepan over medium heat. Add the garlic, and cook for 60 seconds, then add the cream, zest and juice of the lemons, 2 teaspoons salt and 1-teaspoon pepper. Bring to a boil, then lower the heat and simmer for 15 to 20 minutes, until it starts to thicken.
Bring a large pot of water to a boil, add 1-tablespoon salt and the pasta, and cook al dente according to the directions on the package, about 12 minutes, stirring occasionally. Drain the pasta and return it to the pot. Immediately add the cram mixture and cook over medium-low heat for 3 minutes, until the pasta has absorbed most of the sauce. Pour the hot pasta into a large bowl and add the arugula, Parmesan, tomatoes and shrimp. Toss well, season to taste and serve hot.
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