Start with the flour, not the filling

A Victorian sponge is judged on its crumb before anyone reaches for the jam. Cut it open and you should see an even, fine texture with no dense band along the bottom and no rubbery edge where the batter met the tin. Flour is the quietest ingredient in the bowl and the one most often swapped without thinking, yet it decides whether your sponge rises lightly or sits heavy on the plate. In our Lancashire kitchen, a batch that looks tight or damp on the cut never leaves the counter, however good the filling is. Get the flour right and the rest is simply technique.

Plain, self-raising or a dedicated sponge flour?

For a classic Victorian sponge, self-raising flour is the practical choice. It already carries a balanced amount of raising agent, so a four-egg mix behaves predictably. If you prefer plain flour for its cleaner flavour, add raising agent yourself at roughly two level teaspoons of baking powder per 200g of flour, and sift them together twice so the powder is spread evenly rather than landing in pockets.

• Self-raising flour — usually 9–10.5g protein per 100g with raising agents included. The reliable default for a sandwich sponge.
• Plain flour plus baking powder — gives you control over the lift, which is useful if your flour has been open in the cupboard for a while.
• Sponge or cake flour — milled finer and lower in protein, giving a very tender crumb, though the layers are a little more fragile to handle.
• Bread or strong flour — avoid it here. At 12–14g protein it builds far too much gluten, and you will taste the chew.

Whichever you pick, check the date on the packet. Raising agents fade with age and damp, and an old bag of self-raising flour is the most common reason a familiar recipe suddenly fails.

Why protein matters more than brand

Turn the packet over and read the protein figure rather than the picture on the front. For a Victorian sponge you want something in the region of 9–10.5g per 100g. Below that, the cake can be so tender it crumbles when you lift a slice. Above 11g, the gluten network tightens and the crumb turns bouncy and slightly tough, even if you fold like a saint.

Flour also drinks in moisture from the air, and a Lancashire kitchen in February is a very different place from the same kitchen in July. Keep your flour in an airtight container, store it somewhere cool and dry, and if the batter looks noticeably slacker than usual on a humid day, add an extra spoonful of flour and fold it through gently.

Sifting, folding and a light hand

Sift the flour twice, even if the packet says it is pre-sifted. This isn't ceremony: it separates clumps and traps air, which is the cheapest lift you will ever get. Then fold rather than stir.

Use a large metal spoon or a flexible spatula. Cut down through the middle of the mixture, sweep round the side of the bowl, lift and turn the batter over on itself. Give the bowl a quarter turn after each fold. Stop as soon as the last few streaks of flour disappear — a faint marbling is better than a perfectly uniform mix that has been worked for a minute too long. Every extra fold develops gluten, and gluten is what makes a sponge heavy.

Do the same with the creamed butter and sugar: beat until genuinely pale and fluffy, around five minutes, then add the eggs one at a time. If the mixture starts to look grainy or curdled, fold in a spoonful of the weighed flour before adding more egg. It steadies the emulsion and prevents the split that leads to a greasy, sunken cake.

The small details that keep a sponge even

• Weigh the batter between the two tins rather than eyeballing it — even layers bake at the same rate.
• Line only the bases. Paper up the sides stops the sponge gripping the tin as it rises.
• Bake at 180°C conventional, 160°C fan or gas mark 4, on the middle shelf, for 20–25 minutes for 20cm tins.
• Don't open the oven door in the first fifteen minutes. A draught at that stage collapses the rise.
• Test with a light press: the top should spring back and the sponge should just be shrinking from the sides.
• Leave in the tins for ten minutes, then turn out onto a wire rack and cool completely.

Filling, cooling and keeping it fresh

Never fill a warm sponge. The steam softens the crumb and the cream slides. Once cold, sandwich with good raspberry jam and lightly whipped double cream, or a vanilla buttercream if the cake is travelling, and dust the top with caster sugar rather than icing sugar — it stays put and doesn't dissolve into the surface.

Press the layers together with a gentle, even hand; you are settling them, not squashing the air out. An unfilled sponge keeps for two days in a tin lined with baking parchment, and the layers freeze well for a month. Once cream is involved, refrigerate and bring it back to room temperature half an hour before serving, so the crumb softens again and tastes as it should: light, even and unmistakably Victorian.