Classic Italian lasagne with garden salad recipe

Ingredients

• 1 tablespoon vegetable or rice bran oil
• 1 small brown onion, finely chopped
• 1/2 medium carrot, coarsely grated
• 1 celery stick, finely chopped
• 2 tablespoon tomato paste
• 350 gram lean beef mince
• 400 gram jar italian tomato pasta sauce
• 40 gram butter
• 2 tablespoon plain flour
• 1 1/4 cup skim milk
• 3 fresh lasagne sheets
• 1/4 cup grated mozzarella cheese
• 2 tablespoon finely grated parmesan
• mixed salad, to serve