Heat 2 tablespoons of oil in a casserole over medium-high heat.
Add your leeks, celery, and mushrooms to the pan, letting them sweat for 5 minutes.
Then add your 5 cloves of garlic and cook for another minute.
Stir in the gochujang and miso paste and cook for another minute before pouring in your vegetable stock.
Add the carrots and potatoes, season with salt and pepper, and boil.
Reduce the heat to medium-low and simmer for 20 minutes.
Then add the corn quarters and the roughly chopped courgette while you prepare a corn flour mixture in a small bowl to thicken the sauce.
Stir in the parsley or coriander and season to taste with salt and pepper.
Finally, transfer the stew to a serving bowl with extra parsley or coriander to garnish.
Let the dish cool enough so you can eat the sweetcorn with your hands.