Preheat oven to 375 °F (190 °C). Grease and line a 9 × 5 inch loaf pan with parchment paper.
In a large bowl, combine ground beef and ground pork, Using the large holes of a box grater, grate in the onion. Add the minced garlic, eggs, ¼ cup sugar free ketchup, milk, chopped parsley, salt, pepper, and the pork rind crumbles. Mix lightly until just combined — overmixing can make the meatloaf dense.
Transfer the mixture to the prepared loaf pan and shape into a loaf. Bake for 40 minutes.
After 40 minutes, remove loaf from oven, spread the remaining ⅓ cup ketchup evenly over the top, and return to oven for an additional 15 minutes (or until the internal temperature reaches 160 °F /70 °C).
Remove from oven and let rest for 10 minutes before slicing. Drizzle any pan juices over slices when serving.