Preheat the oven to 200°C/400°F.
Prepare a baking tray or cookie sheet with parchment paper or aluminum foil.
Mix all of the ingredients together in a large mixing bowl. You may want to use your hands to squeeze and mush everything together.
375 g ground beef, 375 g ground pork, 38 g flaxseed meal, 1 egg, 2 tbsp sugar-free ketchup, 1 tbsp dijon, 1 tbsp Worcestershire sauce, 1/2 tsp garlic powder, 1 tsp salt, 3/4 tsp black pepper
Roll the mixture into 1 - 2 inch balls and place them on the prepared tray, ensuring they don't touch.
Bake for 20-24 minutes, turning them halfway through. When turning the meatballs, flip them over gently as they can be a little delicate when they're still hot.
Remove them from the oven and allow them to cool down.
Once they're cool, place them on a clean cookie sheet and pop the cookie sheet in the freezer for 3 hours until set.
After the meatballs have frozen you can remove them from the baking tray and store them in an airtight container or ziptop bag for up to 3 months.