Walk into a good tea room and the cakes on the counter look as though they were made an hour ago. There's no trick to it. It's storage, temperature and a bit of discipline with a knife — the three things most home bakers treat as an afterthought.

Cake is fragile in ways that aren't obvious. It dries from the cut face outward, it absorbs the smell of whatever sits beside it, and it tastes of almost nothing when it's cold. Fix a handful of small habits and your baking will hold its flavour from the first slice to the last, whether it's a Victoria sandwich for four or a fruit cake you're keeping back for a fortnight.

Here are the eight mistakes that cost bakers the most, and what to do instead.

Mistake 1: Treating the fridge as the default home for cake

Chilling a sponge is the quickest way to make it taste stale. Cold tightens the crumb, sets the butter in buttercream to something like putty, and mutes flavour — which is why a slice eaten straight from the fridge often tastes sweet but of nothing in particular.

Plain sponge, fruit cake, drizzle cakes and anything with buttercream are happiest in an airtight tin in a cool, dark cupboard, away from the oven and the kettle. Line the tin with baking paper, keep the cake on its base or a board, and put the lid on properly. A tin with a loose lid is a drying rack with pretensions.

The exception is anything involving fresh cream, custard, cream cheese frosting or cut fruit. Those belong in the fridge, covered, and eaten sooner rather than later. Seal them well and keep them on a shelf away from onions and leftovers — butter and cream pick up other smells faster than you'd expect.

Mistake 2: Leaving the cut face open to the air

The cut face of a cake is a sponge in the literal sense. One slice out of a Victoria sandwich gives the air a whole new surface to dry, and by the next afternoon that edge is noticeably firmer than the middle.

Push a piece of baking paper flat against the exposed crumb before you close the tin. If there's a gap around the cake, a slice of white bread or half an apple in the tin will give up its moisture to the cake — change it daily so it doesn't turn. Never store cake beside a cut onion or a strong cheese; you will taste it.

When only a slice or two is left, wrap them individually in baking paper and cling film and eat them within a couple of days.

Mistakes 3 and 4: Slicing cold cake, and using the wrong knife

Temperature first

A cold cake looks easier to cut, which is why so many people do it. In practice, cold sponge crumbles and shears, frosting cracks, and layers slide. Bring sponge and buttercream cakes out of the tin and let them sit for around half an hour before cutting. Set cakes — cheesecake, set ganache, mousse fillings — are the opposite: chill them properly, cut them cold, then let the slices relax for five minutes before serving.

The right knife

Use a long, thin, serrated blade for sponge, and a thin, straight, sharp blade for cheesecake and dense chocolate cakes. A short, thick knife squashes more than it cuts, and a blunt one crushes the crumb no matter how carefully you saw.

Cutting a clean slice

  1. Mark the top of the cake into even portions with the back of a knife, so you're cutting to a line rather than guessing.
  2. Dip the blade in hot water and dry it. Warm metal glides through buttercream and ganache.
  3. Cut straight down, using the full length of the blade. For sponge, use a gentle sawing motion across the top and let the serrations do the work.
  4. Withdraw the knife the same way it went in, then wipe it, dip it and dry it before the next slice.
  5. Let each slice stand for a minute on the plate before serving. It firms slightly and holds its shape.

If a cake is very fragile — a fresh cream layer cake, say — cut it with a hot, dry knife and lift each slice with a wide palette knife or cake lifter rather than your fingers.

Mistake 5: Storing every cake as though it were the same cake

Cakes have different needs and different shelf lives. A rich fruit cake improves with careful wrapping; a fresh cream gateau is a two-day proposition; meringue hates the fridge. Store them all the same way and something is always kept wrong.

  • Plain sponge, drizzle cakes, buttercream-frosted cakes: airtight tin, cool cupboard, two to three days.
  • Fruit cake: wrapped first in baking paper, then foil, then left to mature in a tin. It keeps for weeks and gets better for it.
  • Fresh cream, custard, cream cheese fillings and cut fruit: fridge, covered, eaten within a day or two. If it has sat out on a warm table for hours, throw it away rather than risk it.
  • Meringue and pavlova bases: a dry cupboard, never the fridge, where they soften into marshmallow.

Keep flavours apart, too. A lemon cake stored beside a chocolate one in the same tin will swap notes within a day. Wrap each cake, or at least give each one its own tin.

Mistake 6: Freezing and thawing in a rush

Freezing cake is a good idea done badly more often than not. Freeze unfilled, unfrosted layers — frosting cracks and cream splits when it thaws. Cool the cake completely, wrap it twice (cling film, then foil or a freezer bag) and press out the air.

Thaw it in the wrapping, at room temperature, still sealed. That takes a few hours for a single layer and overnight for a whole cake, but it means the condensation forms on the plastic rather than in the crumb. Unwrap only once the cake has come back to room temperature. Don't thaw in a microwave, and don't refreeze a cake you've already thawed.

If a thawed sponge tastes dry, brush the layers lightly with sugar syrup before you fill them. That's exactly what a tea room does with a sponge that has spent a day in the freezer.

Mistakes 7 and 8: Serving fridge-cold cake, and keeping it too long

Flavour needs warmth. Buttercream straight from the fridge tastes greasy, and a cold plate undoes whatever you did to the cake. Take it out 30 to 45 minutes before serving, and let the plates come to room temperature as well.

Add the finishing touches at the last moment: clotted cream, whipped cream, ice cream, berries. Dress them onto plates minutes before they go out, not an hour ahead. Cut portions that suit the cake, too — a 20cm round sponge yields ten to twelve slim slices, which is a tea room slice rather than a slab. Slim slices taste better and last longer.

Finally, know when to stop. A plain sponge is at its best on day one and perfectly good on day two; by day four it's a different, drier thing. Rather than keep it going, use the last of it — toast it, layer it into a trifle, warm it through with

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