In a small bowl, combine the ketchup, sriracha and 1 t. of the Worcestershire sauce. Set aside.
Heat the olive oil in a small skillet and saute the onion, garlic, and carrot until the onion and carrot are soft. Stir in the spinach, pepper, salt, and remaining 1 1/2 t. Worcestershire sauce and saute just long enough to wilt spinach then transfer the mixture into a large bowl.
Pour the breadcrumbs and milk into the bowl.
Add in the eggs, turkey, and 2 T. of the ketchup mixture. Mix everything together until well combined (I prefer to use my hands) and then transfer the mixture to a loaf pan, patting to smooth the top into a rounded loaf.
Pour 1/2 C.-3/4°C of the remaining ketchup mixture on top of the turkey and spread evenly. I like to save a bit of the sauce to serve along side the meatloaf.