Pasta with Salmon Cream Sauce

8 ounces penne or ziti or other tubular pasta
2 teaspoons butter or margarine
2 teaspoons onion, minced
2 teaspoons flour, all purpose
pepper to taste
1 cup peas
1 cup salmon, fresh or canned
1/4 cup parsley
1/4 cup Parmesan cheese
1 1/4 cups milk

In large pot of boiling water, cook pasta al dente about 10 to 12 minutes. Drain and return to pot. In saucepan, melt butter over medium heat, add onion and cook until tender. Stir in flour and cook for a few seconds. Whisk in milk and bring to a simmer, stirring constantly. Add peas, salmon broken into chunks and salmon juices, parsley, cheese and pepper to taste. Pour mixture over pasta and stir gently to mix. Serve immediately. Serves 4.