2. Cook Filling
Heat the oil in a large pot over medium heat. When the oil is shimmering, add the onion and garlic and cook, stirring, until the onion is translucent, 5 to 7 minutes. Add the chicken and continue to cook, stirring, until lightly browned, about 5 minutes. Add the chicken stock, carrots, and potatoes. Bring to a simmer, cover, and cook until the vegetables start to tenderize, about 5 minutes.
Add the peas, raisins, soy sauce and sugar. Return to a simmer and cook, uncovered, for 5 minutes. Remove from the heat and spoon off excess liquid. Stir in the salt and pepper and let cool to room temperature.