Preheat oven to 200°C fan forced. Lightly grease a 10-cup capacity baking dish.
Cook macaroni in a large saucepan of lightly salted boiling water for 6 minutes, or until tender.
Meanwhile, melt butter and garlic in a large saucepan over a medium heat. Cook, stirring until foaming. Add flour and cook, stirring for 1 minute. Whisk in milk. Bring to the boil, stirring constantly. Stir in 1 1/2 cups of the cheese. Season with salt and ground white pepper.
Drain the pasta and return to the pan. Add the sauce and mix well. Spoon into the prepared dish. Scatter with remaining cheese.
Combine Solanato® tomatoes and oil in a bowl. Season. Spoon over the macaroni in the dish. Bake for 30-35 minutes, or until cheese is bubbling and tomatoes soften.