Heat oil in a large frying pan. Add onion and garlic and cook for 5 minutes, until softened, then add mince and brown well. Pour in the tomatoes and sprinkle over the dried oregano. Simmer, stirring occasionally, for 10 -15 minutes, until thickened. Season with salt and pepper, to taste.

Preheat oven to 180 C. Grease a medium oven proof baking dish. Line base with ¼ of the lasagna sheets, trimming to fit if necessary. Spoon 1/3 or the mince mixture over the lasagna, cover with a generous layer of béchamel sauce.

Repeat the layering twice. Cover béchamel with a layer of lasagna sheets, and spread over the remaining béchamel. Sprinkle over the cheese and bake for 30-40 minutes, until the pasta is tender and cheese is golden brown. Cover with foil if necessary during baking, to prevent cheese from burning.