If you incorporate these ingredients in your cooking, your left-overs will last longer:
- honey
 - salt
 - garlic
 - sugar (only in high amounts according to feedback; small amounts shortens the life)
 - ginger
 - sage
 - rosemary
 - sage
 - mustard
 - cumin
 
Additionally from other articles:
- black pepper
 - mustard seed
 - turmeric
 - cinnamon
 - cardamom
 - cloves
 
Acids mentioned by others:
- vinegar
 - citric acid
 - lemon/lime juice
 
I just had some harissa get moldy after just a couple weeks in a jar in the fridge. I was surprised. I suppose it implies a lack of the above ingredients.



I would assume the same is true for honey, since honey is just a solution of sucrose and glucose thats high enough in concentration of those sugars that it won’t mold, but it will if you dilute it
i wondered about that.