Clean the intestines well. Make sure to wash it with running water especially the inside part. Set aside.
Pour water and vinegar in a large cooking pot. Add ginger, whole peppercorn, bay leaves, and 2 tablespoons salt. Bring to a boil.
Add the intestines. Boil for 1 hour. You can repeat the process to ensure that the intestines smell less pungent. However, make sure to discard the initial water used, and add a new set of ingredients for boiling.
Remove the intestine from the cooking pot. Let the excess water drip. Slice crosswise into smaller pieces.
Arrange the intestines in a bowl. Add 1 tablespoon salt, cumin, garlic powder, ground black pepper, and cayenne pepper powder. Mix well. Cover the bowl and refrigerate overnight.
Skewer the intestine slices using a bamboo skewer.
Heat-up your grill. Grill each side for 3 minutes. Repeat the process until the isaw or intestines are fully cooked. Baste continuously with a mixture of sugar, banana ketchup, soy sauce, vinegar, and oil.
Serve with spicy vinegar. Enjoy!