Sieves and strainers are chosen by mesh, not by handle

The theory of sieves and strainers is well covered elsewhere. This is about the version you meet in practice.

Coarse and fine do different work

A colander with large holes drains water from pasta or vegetables quickly and lets steam escape. It cannot hold back anything small, which is why grains and small pulses go straight through it. A fine mesh sieve holds back particles that are invisible in a liquid but perceptible on the tongue.

Between them sits a medium mesh that handles most everyday straining and rinsing. Owning one coarse and one genuinely fine covers considerably more than owning two similar medium ones.

What a fine sieve does that a blender cannot

Blending reduces particle size but cannot eliminate fibres, skins and seeds, which remain as texture in the finished liquid. Passing a puree through a fine sieve physically removes them, which is why restaurant sauces feel different. The difference is most obvious in fruit purees, tomato sauces and anything containing a skin or a seed.

If you are short of time, it costs a few minutes and one extra item to wash, and the improvement is out of proportion to the effort. Pressing the mixture through with a spoon or a ladle extracts far more than letting it drip.

Sifting dry ingredients

A sieve breaks up lumps in flour, sugar and cocoa, which is the whole reason baking recipes ask for it. It also aerates the flour, which makes a difference when the mixture will be folded rather than beaten. For anything that dissolves, such as icing sugar, sifting prevents grains that would otherwise never disperse.

The part that matters: a dedicated sifter is unnecessary, since any fine sieve does the same job and is more useful the rest of the time. Sifting is one of the steps most often skipped and one of the most consistently worth doing.

Straining stock and clarifying

A stock strained through a coarse sieve retains fine particles that make it cloudy and slightly gritty. Passing it through a fine mesh, or through cloth laid in a sieve, produces something clearer and cleaner tasting. Pressing the solids extracts more liquid but also pushes fine particles through, so it is a trade rather than an improvement.

Letting it drip without pressing gives the clearest result and the smallest yield.

Which you want depends entirely on whether the stock is for a clear soup or for a braise.

Materials and construction

Fine mesh clogs easily and needs to be washed promptly, ideally from the outside inwards so the particles fall away. A frame that traps food where the mesh meets the rim is the most common construction fault and the hardest to clean.

A hook or a rest that lets the sieve sit on a bowl frees both hands, which matters more than it sounds. Metal tolerates hot liquid and boiling water for cleaning, while plastic can distort and stain. A cheap fine sieve that deforms out of shape is worse than useless, since a distorted rim will not sit on anything.

If you are cooking for allergies, check every label rather than any recipe.

What is genuinely worth owning

One large colander, one medium sieve and one small fine one covers almost every domestic situation. A conical sieve is a specialist item that concentrates the flow and suits pressing purees, but it is not essential.

Cloth laid inside an ordinary sieve substitutes for anything finer and costs nothing. Nesting them together saves the storage problem, which is often what stops people owning the third one. The fine sieve is the one most kitchens lack and the one that most changes the quality of what comes out of them.

The takeaway

Own one coarse drainer and one genuinely fine sieve, and pass anything that should be smooth through the fine one.

Taste it before it leaves the pan. That is most of cooking.