Baked Ziti - Lindsay Merrill - Camp

1 16 oz box ziti pasta
½ medium onion
1 TBS olive oil
2 garlic cloves minced
1 lb lean ground beef - or Italian sausage
1 26 oz jar tomato and basil pasta sauce
1/4 tsp salt
3 TBS butter
3 TBS flour
3 Cups milk
1 Cup grated Parmesan Cheese
½ tsp pepper 1 8 oz package shredded mozzarella cheese
1.  Cook pasta according to package directions, drain and return to Dutch oven
2.  Saute onion in hot oil in skillet over medium high heat 5 minutes or until tender.  Add garlic and saute 1 minute.  Add beef and cook stirring until beef crumbles and is no longer pink.  Drain beef mixture and return to pan.  Stir in pasta sauce and 12 tsp salt.  Set Aside
3.  Melt butter in a heavy saucepan over low heat; whisk in flour until smooth.  Cook, whisking contantly 1 minute.  Gradually whisk in milk; cook over medium heat, whisking constantly until mixture if thickened and bubbly.  Stir in Parmesan cheese, remaining 1/4 tsp salt and pepper.  Pour sauce over pasta in Dutch oven stirring until pasta is evenly coated.
4.  Transfer pasta mixture to a lightly greased 13 x 9 inch baking dish.  Top evenly with beef mixture; sprinkle evenly with mozzarella cheese.  
5.  Bake at 350 for 20-25 minutes or until cheese is melted.  Let stand 10 minutes before serving.