"This was one of my favorites as a kid. The flavor is sweet, salty, and tangy, but it all balances out. Plus it's meat on a stick, and what kid—or adult—doesn't love that?" –Lean Cohen of Pig & Khao. Note:Allow at least one day for marinating.
Combine soy sauce, banana ketchup, pepper, Sprite, lemon juice, garlic, ginger, sugar, and salt in a bowl; add chicken and toss to combine. Cover and refrigerate overnight.
Light a grill. Thread chicken onto skewers, reserving marinade, and brush with oil; grill, turning as needed and brushing with reserved marinade until charred and cooked, about 12 minutes. Transfer to a serving platter and garnish with scallions and crispy garlic.