Place the peppers with the vinegar, food coloring, soy sauce, red pepper flakes, chopped ginger, and garlic in a saucepan and simmer on medium heat for 15 minutes. Remove from the heat (but don't turn off the flame.)
While simmering, combine the cornflour with water to make a smooth paste, then stir into the sauce while off the heat.
Replace the pan back onto the heat and simmer while stirring consistently, until thickened
Pour into a jar and allow to cool completely.
Notes
If you use a sterilized canning jar, this sauce can keep for up to two months, unopened. Eat within two weeks when opened (or if not kept in a sterilized jar.)