Prepare rigatoni using package instructions. Drain and set aside. In a large saucepan on medium heat, melt butter and add flour, stirring constantly. Mixture should thicken. When flour thickens add milk, salt, paprika and cheese cubes. Stirring constantly until sauce thickens but yet is smooth. The cheese sauce should resemble an extra thick cream. If mixture is too thick a little more milk may be added. Pour the drained pasta in the sauce and gently stir well. When pasta is completely coated with sauce, mix well, the Mac A Roo is ready to serve.
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