onion - 4 ounces (4 ounces, a little more than ½ cup)
garlic cloves - 4
chicken thigh (or breast) - 1 pound (a little more than 1 pound, fat removed and patted dry)
salt - 1 ½ teaspoons
ground black pepper - ½ teaspoon
whole milk - ¼ cup
potato starch (or corn starch or flour) - 1 tablespoon
zucchini - 5 ounces (4 to 6 ounces, sliced thinly into matchsticks)
sesame oil - 1 tablespoon
mandu skins - 44 discs (large or small size, about 2 packages for 30 dumplings)
soy sauce - 1 tablespoon (for dipping sauce)
vinegar - ½ tablespoon (for dipping sauce)
gochugaru (hot pepper flakes) - ¼ teaspoon (for dipping sauce)