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Heat oil in a pan over medium heat.
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2. Add diced onion and cook for 4 to 5 minutes until softened. Add minced garlic and grated ginger; cook for 1 minute.
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3. Transfer the onion mixture to a slow cooker.
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4. Add gochujang, soy sauce, brown sugar, rice vinegar, sesame oil, and chicken stock to the cooker. Stir until well combined.
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5. Add chicken thighs and turn to coat in the sauce.
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6. Cook on LOW for 3 to 4 hours until the chicken is tender.
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7. Remove cooked chicken and shred with two forks.
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8. Return chicken to the sauce; if desired, stir in the cornflour slurry to thicken and cook on HIGH for another 10 minutes.
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9. Cool completely before portioning into ½-cup Souper Cubes.