Prepare the filling: season 1/2 kg of ground beef with salt and black pepper. Add 2 tablespoons of olive oil, sauté 2 tablespoons of onion and combine with the beef. Let it cook until golden brown and add 2 tablespoons of tomato puree, 4 tablespoons of chopped parsley. Cook for about 5 minutes and reserve. Prepare the white sauce: melt 2 tablespoons of butter and sauté 2 tablespoons of onion. Add 8 tablespoons of all-purpose flour, stirring for about 2 minutes. Remove from heat and add 2 cups of milk, stirring constantly. Return to heat and cook until thickened. Season with salt. Cook 1/2 kg of ready cannelloni pasta and fill each strip with the prepared beef filling. Arrange in a baking dish greased and topped with the white sauce. Sprinkle with grated Parmesan cheese and place under the broiler. When golden brown, remove from heat and let it rest for about 5 minutes. Serve hot to 4 or 5 people.
Prepare the filling: season 1/2 kg of ground beef with salt and black pepper. Add 2 tablespoons of olive oil, sauté 2 tablespoons of onion and combine with the beef. Let it cook until golden brown and add 2 tablespoons of tomato puree, 4 tablespoons of chopped parsley. Cook for about 5 minutes and reserve. Prepare the white sauce: melt 2 tablespoons of butter and sauté 2 tablespoons of onion. Add 8 tablespoons of all-purpose flour, stirring for about 2 minutes. Remove from heat and add 2 cups of milk, stirring constantly. Return to heat and cook until thickened. Season with salt. Cook 1/2 kg of ready cannelloni pasta and fill each strip with the prepared beef filling. Arrange in a baking dish greased and topped with the white sauce. Sprinkle with grated Parmesan cheese and place under the broiler. When golden brown, remove from heat and let it rest for about 5 minutes. Serve hot to 4 or 5 people.
