Heat the vegetable oil in a large pot over medium heat. Add the onions and cook for 5 minutes until soft and translucent. Stir in the garlic and ginger and cook for 1 minute until fragrant.
1 ½ tablespoons vegetable oil, 2 cups onion, 2 cloves garlic, 1 teaspoon fresh ginger
Add the chicken and cook until lightly browned on the outside.
1 ½ pounds boneless skinless chicken thighs
Pour in the chicken broth, then add the grated apple, honey, soy sauce, and ketchup. Stir well.
1 apple, 4 cups chicken broth, 1 tablespoon honey, 1 tablespoon soy sauce, 1 tablespoon ketchup
Add the curry roux and stir until fully dissolved.
1 package Japanese curry roux
Add the carrots and potatoes. The liquid should just cover the ingredients.
2 carrots, 3 Yukon potatoes
Cover and simmer over medium-low heat for 15 to 20 minutes, stirring occasionally.
Continue cooking until the vegetables are tender and the curry has thickened.
Serve hot over steamed Japanese rice.
Cooked Japanese short-grain rice