Tossing this up here so I can throw away the nasty, wrinkly, old piece of paper that’s been floating around my kitchen for a couple years now.
3T soy sauce
2T rice vinegar
3T chicken stock
4T brown sugar
1t sesame oil
2t minced garlic
2t minced or grated ginger
1T cold water
Combine everything except the cornstarch and water in a sauce pan and bring to a simmer.
Combine the cornstarch and water to make a slurry. Add to the simmering sauce, stir to thicken.
For a little heat, add crushed red pepper flakes.
For a citrus-y kick, add 1T orange juice and 2T lemon juice.
Pull back the sweetness some by using molasses instead of brown sugar.