Preheat the oven: preheat the oven to 180°C / 350-375°F / Gas Mark 4-5.
Onion: use a knife and cutting board to peel and dice the onion.
Sausages: use a smaller knife to remove the casing (skin) off each sausage and then chop the sausages into chunky pieces.
Cook: place a large sauté pan onto the stove top, turn the heat to high and add the olive oil. Next add the garlic and cook for 1 minute. Add in the chopped sausage pieces as well as the diced onion. Cook till the sausage is browned (6-8 minutes).
Sauce: turn the heat on the sausages down (simmer/low) and then pour in the passata, diced tomatoes, tomato paste, Worcestershire sauce, beef stock cubes (crushed over the top with fingers) and Italian herbs and once done stir gently to combine.
Pasta: cook the rigatoni according to package instructions in a large sauce pan of boiling salted water. Drain once cooked and discard pasta water.
Baking dish: whilst the pasta is cooking grease a large baking dish (20 cm x 30 cm, 8 inch by 12 inch) with olive oil using a basting brush to coat the base and sides.
Combine: add the cooked pasta to the sauce and sausage mixture. Gently to combine.
Transfer: transfer the combined pasta and sausage mixture into the greased baking dish.
Cheese: sprinkle the shredded cheese over the top to form a layer then dollop the ricotta over the shredded cheese.
Oven bake: place the baking dish into the preheated oven on the middle shelf. Let the dish bake and cheese melt for 15 to 20 minutes. Once done use oven mitts to remove the baking dish from the oven and place it onto a heatproof surface.
To serve: season with cracked black pepper and garnish with basil leaves, portion and serve hot.