How do we shop for someone else's recipe?

Ask what the ingredient does in the dish

A lemon for zest needs its peel; a lemon for juice may allow a different choice. “Cream” might be intended to whip or merely to enrich a sauce. Ask the cook which property matters before relying on a substitute that sounds similar but cannot perform the required job.

Give the shopper a short brief

Before they leave, ask the cook to name any flexible items and their preferred response to shortages. If spring onions are unavailable, could chives work, or should the shopper leave them out? A short answer now saves both people from reading a long recipe on a phone in the shop.

For each unusual item, record its form, quantity, purpose, and an acceptable backup. A useful entry is “one fresh lemon for zest and juice; skip dessert if there are none.” This is clearer than forwarding a whole recipe and assuming the shopper will discover the constraint while standing in the aisle.

Resolve missing details before the trip

If the recipe says “one packet,” ask for its actual size or the brand used when the recipe was written. If the cook cannot say, check the original source or pick another dish with clear quantities. The person doing the shopping should not have to invent a measurement and then take responsibility for a failed meal.