Identify the meal each essential supports
Put “rice for Thursday bowls” above optional extras so the shopper can tell which purchase protects a dinner. Check whether the same role is already covered at home. If a suitable grain is already in the cupboard, buying rice may be optional for this trip even if the recipe calls for it.
Leave room for a real choice
Agree on what the shopper should do if prices are higher than expected. They might buy the first group and one favorite treat. Avoid quietly putting one person's requests at the bottom every week; take turns choosing which optional item gets priority when the budget is tight.
Set a simple rule such as “after the dinner ingredients, choose one treat within the remaining amount.” Agree whether both people want a shared treat or one person is choosing this week. Avoid disguising a preference as an essential merely to guarantee it gets into the basket.
Respond to a higher checkout estimate
If prices rise, look at the items in order. A different brand may preserve a planned dinner; removing its main ingredient may leave several other purchases with no use. Tell the cook what changed, especially if the affordable substitute needs a different recipe. Record any treat deliberately postponed so it can be reconsidered without becoming a permanent promise.