Smoked Salmon Lasagna

INGREDIENTS
1/2 medium onion, chopped
1/4 cup margarine, divided
1/4 cup flour
2 cups milk
2 cups smoked salmon, crumbled
1/4 teaspoon pepper, or to taste
1 pint cottage cheese
1 tablespoon dried parsley
1 tablespoon Worcestershire sauce
1/4 cup grated Parmesan cheese
9-12 lasagne noodles, uncooked (yes, uncooked)
1/2-3/4 pound grated mozzarella cheese
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