Heat the olive oil over a high heat and brown the mince for approximately 6-8 minutes.
Meanwhile, cook the macaroni until al dente.
After browning the mince, pour it into a sieve over a bowl, to drain all the liquids.
On a low to medium heat, cook the diced onion until see through. Do not brown.
Add the garlic and cook until fragrant.
Return the mince to the pan and add the tomato paste, tinned tomatoes, Worcester sauce, oregano, stock and a few crunches of salt and black pepper.
Allow to cook for half an hour and then season to taste.
Take a 1 tablespoon of yoghurt and mix with the corn flour until it is a smooth paste. Gradually add two more tablespoons, one at a time. Then add that mix to the rest of the custard ingredients.
Heat your oven to 180°.
Mix a third of the custard to the macaroni. And place the macaroni at the bottom of a large lasagna dish.
Pour the meat sauce over the pasta.
Spread the remaining custard over the meat and sprinkle with Parmesan and ground salt and pepper.
Pop the dish in the oven for 40-45 minutes, or until bubbling and golden.