Heat the olive oil in a large saucepan over medium heat. Add the smashed garlic and cook 1 minute. Add the tomatoes with their juice, 2 cups water, 1/4cup basil, the parmesan rind, if using, and salt and pepper to taste. Bring to a boil, then reduce the heat and simmer until thickened, about 8 minutes. Discard the parmesan rind, if used.
Chop the remaining 1/4cup basil, then mix with the turkey, parsley, bread, ricotta, parmesan, egg white, minced garlic, 1/2 teaspoon salt, and pepper to taste in a bowl using your hands. Form into 4 large or 12 small meatballs; add to the sauce and simmer, turning, until cooked through, 6 minutes for small meatballs and 12 minutes for large.
Meanwhile, cook the spaghetti in a large pot of salted boiling water as the label directs. Drain and return to the pot. Toss with some of the sauce, then divide among bowls. Top the spaghetti with the meatballs, the remaining sauce and more parsley and parmesan.
Photograph by Antonis Achilleos
Courtesy of Food Network Magazine