Prepare the sauce by heating oil in a pot.
Saute onion and garlic.
Once the onion becomes soft, add the corned beef. Stir and cook for 3 to 5 minutes.
Pour tomato sauce. Stir. Add beef broth. Let boil. Cover and continue to cook for 20 minutes using low to medium heat.
Add tomato paste, salt, ground black pepper, and sugar. Stir. Continue to cook for 5 minutes. Set aside.
Prepare the macaroni by boiling water in a cooking pot. Add 1/4 teaspoon salt.
Once the water boils, put the macaroni into the pot and cook for 7 minutes.
Drain the water from the pot. Combine macaroni with meaty tomato sauce. Add the cheeses and mix well. Transfer the mixture into a baking pan.
Preheat oven to 375F. Bake for 15 minutes.
Remove from the oven and serve.
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