Mix the meatballs: In a large bowl, combine ground beef, ground pork, egg, almond flour, Parmesan, garlic, green onion, onion powder, salt, pepper, and smoked paprika. Mix gently with your hands until just combined.
Don’t overwork it.
Shape: With damp hands, form 18–22 small meatballs (about 1 to 1.5 inches). Place on a plate.
Sear the meatballs: Heat avocado oil in a large skillet over medium to medium-high heat. Add meatballs in a single layer without crowding.
Sear until browned on all sides, about 6–8 minutes total. Transfer to a plate. They don’t need to be fully cooked yet.
Start the sauce: Lower heat to medium.
In the same skillet, add garlic and cook 30 seconds until fragrant. Stir in keto honey substitute (or honey + sweetener), tamari, vinegar, sesame oil, red pepper flakes, and 1/3 cup broth.
Thicken: Sprinkle in a small pinch of xanthan gum (about 1/4 tsp), whisking constantly. Let it simmer 1 minute.
Add more xanthan gum in tiny pinches until it reaches a glossy, syrupy consistency. If it gets too thick, whisk in more broth.
Simmer with meatballs: Return meatballs and any juices to the pan. Spoon sauce over them, cover, and simmer 6–8 minutes, or until meatballs reach 165°F (74°C) inside.
Finish and serve: Taste and adjust salt, sweetness, or vinegar.
Garnish with sesame seeds and green onions. Serve over cauliflower rice or zucchini noodles.