Heat a large skillet or saucepan over medium-high heat. Add the ground beef and sausage and cook, breaking up the meat, until browned and cooked through, about 6–8 minutes.
Add the diced onion and minced garlic to the skillet with the meat and cook until the onion is softened, about 3–4 minutes. Drain excess fat if needed, then return the pan to the heat.
Stir in the Italian seasoning, kosher salt, and ground black pepper until combined.
Add the crushed tomatoes and diced tomatoes to the skillet and stir to combine. Mix in the Worcestershire sauce if using and the sugar or sweetener if desired. If you prefer a thinner sauce, add up to 1 cup water.
Bring the sauce to a boil, then reduce the heat to low and simmer gently for 15 minutes to allow flavors to meld.
Taste and adjust seasoning if needed, then remove from heat and serve over pasta or as desired.