Preheat the oven to 400°F (200°C) for baking meatballs.

In a mixing bowl, combine ground beef, breadcrumbs, minced garlic, chopped green onion, soy sauce, and sesame oil. Mix until well combined.

Form the mixture into meatballs of desired size and place them on a baking tray.

Bake the meatballs in the preheated oven for about 25 minutes or until cooked through.

For the spicy mayo dip, mix mayonnaise, sriracha, and lime juice in a separate bowl. Adjust sriracha to taste.

Serve the meatballs hot with the spicy mayo dip on the side.