Stir-fry the bacon in a large pan with 1 Tablespoon of oil for about 4-5 minutes, until golden brown and crispy.
Pour out the excess pork fat.
Add radish and stir fry for 1 minute.
Add potato, onion, and zucchini and keep stirring for about 3 minutes until the potato looks a little translucent.
Clear a space in the center of the pan. Add 2 Tablespoons of oil to the center, then add ¼ cup of black bean paste and stir it with a spoon for 1 minute to fry it. Then mix everything together and keep stirring.
Add 2 cups of water to the pan and cook with the lid for about 10 minutes.
Open the lid and taste a sample of the radish and potato. If they’re fully cooked, stir in the starch water little by little. Keep stirring until it’s well mixed and thick.
Add the sesame oil and remove from heat.
Serve with noodles.