Main ingredient, I'm not buying salt, pepper and sugar from the convenience store. Or Butter. If I already have something, why would I be buying it again? Waste of money.
The main thing from your dish MUST come from the convenience store. If I call my recipe " steak and peas" the steak and peas must come from the convenience store.
The main thing from your dish MUST come from the convenience store. If I call my recipe " steak and peas" the steak and peas must come from the convenience store.