Preheat oven to 400°F. Spray a broiler pan or a large baking pan fitted with a rack with cooking spray. Set aside.
To a medium size mixing bowl add ground beef and pork, panko, green onions, milk, teriyaki sauce, cilantro, lime juice, eggs, garlic, salt, pepper, ginger, red pepper flakes, clove and cinnamon.Using your hands, mix everything together thoroughly.
Form into bite sized 1 inch meatballs and place onto the rack. Bake for 25-30 minutes, until no pink remains.
Meanwhile, make sauce. In a medium saucepan, simmer together Thai chili sauce, teriyaki marinade and brown sugar until slightly thickened and reduced. Keep warm.
Add meatballs to sauce, gently stir to coat. Garnish with toasted sesame seeds and chives, if desired.
Serve immediately with picks as an appetizer or over rice drizzled with sauce, as an entree.