In a small bowl, whisk together the soy sauce, brown sugar, sesame oil, rice wine vinegar, chili garlic sauce, garlic, ginger and scallions. Set the mixture aside.
Add the ground beef to a large nonstick skillet set over medium-low heat. Cook, breaking apart the meat with a spatula, until browned. Drain any grease.
Add the sauce mixture to the pan and increase the heat to medium. Cook, stirring, until the meat is cooked through and the sauce has thickened slightly, 3 to 4 minutes.
Spoon the ground beef over rice. Garnish with sliced green parts of scallions. Serve with sliced cucumbers, shredded carrots, fried eggs and sesame seeds (optional).
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