Combine beef, soy sauce, sesame oil, sesame seeds, scallions, and garlic in a large bowl; stir gently until just combined.

Place about two teaspoons meat mixture onto the center of a wonton wrapper. Brush a small amount of water along the edges before pressing them together to help keep them sealed; bring the edges together to form a wonton. Set aside; repeat with remaining meat and wonton wrappers.

Bring a pot of salted water to a boil. Drop a few wontons into the boiling water; cook for about six minutes, until the meat is cooked through. Work in batches to avoid overcrowding the pot. Remove wontons with a slotted spoon; place on Gefen Parchment Paper, not touching each other. Set wontons aside.

Combine all sauce ingredients in a medium pot. Bring to a boil, then reduce heat; simmer mixture for about 15 minutes, stirring occasionally, until sauce thickens.

Just before serving, toss cooked wontons in sauce; warm through.

If desired, garnish with sliced scallions and sesame seeds.