Tammy's Favorite Lasagna

INGREDIENTS

• 4 tablespoons vegetable oil
• 1 large onion, chopped
• 2 pounds lean ground beef
• 2 tablespoons Italian seasoning
• 1 1/2 tablespoons chopped fresh rosemary
• 1 1/2 tablespoons garlic salt
• salt and pepper to taste
• 1 (28 ounce) can whole peeled tomatoes
• 2 (6 ounce) cans tomato paste
• 1 cup water
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• 1/2 cup margarine
• 1 small onion, chopped
• 1 cup Parmesan cheese
• 3 tablespoons all-purpose flour
• 1 quart milk
• 1 egg, beaten
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• 1 (16 ounce) package lasagna noodles
• 1 (15 ounce) container ricotta cheese
• 1 pound mozzarella cheese, shredded