Combine 1/2 cup milk and flour in a large saucepan, stirring with a whisk until well blended. Place pan over medium heat; gradually stir in remaining 1/2 cup milk. Stir in mustard and nutmeg. Bring to a boil; reduce heat to medium-low, and cook 5 minutes or until mixture begins to thicken, stirring constantly. Stir in salt and pepper; cook 1 minute. Add drained pasta mixture, cheese, and chopped basil, tossing gently to combine. Sprinkle with nuts and torn basil.
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