10 Spices That Make Your Food Last Longer - Ask a Prepper
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In every pantry in the world, a spice cabinet is found. Inside, there will be the standard basil, oregano, crushed red pepper flakes, salt, pepper, among many others. Spices allow folks to flavor their food in the way they like. They add so much complexity and nuance to a dish that would otherwise fall flat. […]

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)
  • 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.