Preheat oven to 425 degrees and line a large baking sheet with foil for easy clean up.
Using your hands, lightly mix the beef, veal and sausage. Set aside.
In a blender, add the onion and garlic. Blend until pureed.
Add the onion mixture, stock, fish sauce, panko, parmesan, parsley, salt, pepper and egg to the meat mixture and, using clean hands, mix the ingredients together until well combined.
Gently shape the mixture into balls approximately the size of a golf ball and place on the baking sheet being sure they are not touching.
Bake the meatballs in the oven for 25-30 minutes or until done.
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Notes
Baked Meatballs can be made up to 3 days in advance and stored in an airtight container in the refrigerator. To reheat, either warm in a frying pan with 3 tablespoons of water until warmed through or bake for 10 minutes in a 350 degree oven.What is fish sauce? Fish sauce is a liquid condiment made from fish or krill that have been coated in salt and fermented for up to two years. It is used as a staple seasoning in East Asian cuisine and Southeast Asian cuisine. It can be used interchangeable with Worcestershire sauce with great results.