You should write things down, but then again until you nail what you are doing those writings can be confusing. Start with basic ingredients, and don’t use to many ingredients. Usually the best things are simple. This way you can build it again by eyeball because you know what went in it. If you add something strange maybe write that down but you should only do that if you liked it. My advice just keep it simple. Good sauces generally don’t have a lot of ingredients.
Here is a good one.
Apricot jam (enough to do the job)
Garlic powder to taste.
Soy sauce to taste.
Add garlic and soy until it tastes right. It’s delicious on ham, pork and chicken.