OK. A few months ago I ruined a batch of green chili stew by following my regular recipe but using from a new bottle of ground cloves. Someone who used to cook professionally said always taste new supplies before using them. So glad I remembered! On Sunday I was making meatloaf and had new horseradish (the little glass bottle found near the cold cuts). Phew-eeee! I don't think anything has dared come near my sinuses since.
Obviously some ingredients, Hellman's mayo for instance, are very consistent. Other ingredients like herbs and spices vary because they are less processed. That's part of their charm as long as they don't sneak up on us.
What groceries do you taste first when you get a new supply?