A grocery list with only what’s missing

Why we keep buying what we already have

Most shopping lists are written from memory, in a hurry, away from the cupboard. We add “onions” because the recipe needs them, not because we checked. Multiply that by a week of recipes and the duplicates add up — and so does the food that goes off before we get to it.

A good list does three things: it combines what every recipe needs, subtracts what you already own, and leaves you with the gap.

A five-step routine

1. Plan first. Decide the meals before writing the list, so the list follows the plan rather than the aisles.
2. Combine amounts. Two recipes that each need an onion need two onions, not two lines that say “onion”.
3. Subtract what is at home. Check fridge, freezer and pantry — especially staples like rice, pasta, tins and spices.
4. Add the non-recipe items. Washing-up liquid and breakfast cereal belong on the list too; keep them separate from recipe ingredients.
5. Put the shopping away into your inventory. What you bought is what you have next week.

Staples that cause the most duplicates

Duplicates cluster around long-life staples: spices, tins of tomatoes and pulses, rice, pasta, stock and oils. They are cheap enough that we buy “just in case”, and they hide at the back of the cupboard. Checking just these before a shop catches most duplicate buys.

Fresh produce is the opposite problem: we under-check it because it feels obvious, then buy a second bag of spinach while the first one wilts. Let the plan decide how much you need, and let the inventory say how much you have.