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Thaw the spinach at room temperature and then drain in a strainer. Press as much water out as you can, set aside.
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Bring a large pot of water to boil, add the macaroni. Cook according to package directions, drain and set aside.
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In a large saucepan, add the butter and olive oil over medium heat. Once melted, add the flour and whisk for 2 minutes. Whisk in the milk and allow it to come to a simmer, while whisking. When it simmers, the sauce will thicken. Remove from heat.
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Add the parmesan and pesto, mix well and season with salt and pepper to taste.
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Add the spinach, stirring well, then add the cooked and drained macaroni.
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Serve immediately, garnished with extra parmesan.