In 1½ tablespoons of the olive oil, in a Dutch oven or a large stockpot, sauté the onion with ½ teaspoon salt until soft, translucent and just starting to brown. Add the garlic and continue sautéing for another minute, while stirring. Remove to a plate.
Heat the Dutch oven or stockpot with the remaining olive oil over high heat. Add the ground turkey and crumbled sausage, together with a sprinkle of salt and black pepper, and sauté to brown, stirring often. Remove the excess liquid fat and discard.
Add the anchovies at the bottom of the pot, or anchovy paste, breaking the anchovies up and melting them in the oil at bottom of the pan.
Add in the sautéed onion and garlic, the cans of tomatoes, tomato paste, dried basil, and water. Stir and bring to a simmer. Simmer for 1½ -2 hours over very low heat, with the lid slightly cracked. If using a Dutch oven, you can also bring the sauce to a simmer and move to a 285 degree preheated oven to cook for about 2 hours. Add the torn basil near the end of the cooking time. Add more salt and pepper to taste. Break up the larger pieces of diced tomato using a fork.
The sauce is ready to use in your lasagna now!