How do I stop a rich fruit cake burning during a long bake?
A three to four hour bake will darken the outside long before the middle is done. Double lining, an outer paper band, a low shelf and a late foil cap narrow the gap between how fast the outside and the centre cook.
- Difficulty
- intermediate
- Time
- 20 min
- Read
- 5 min
- Safety
- caution
Short answer
Double-line the tin with parchment standing several centimetres above the rim, tie a band of brown paper or folded newspaper round the outside, stand the tin on a baking tray, bake low and slow — around 140–150°C conventional — and lay a loose sheet of foil over the top once it has coloured.
The problem with a Christmas or wedding fruit cake is not the recipe, it is the geometry. A deep, dense, sugar-heavy batter takes hours for heat to reach the centre of, and everything on the outside is exposed to oven heat for that whole time. Every part of the standard preparation is one thing: insulation, slowing the outside so the centre can catch up. The drawing shows the whole assembly in section — double lining, collar, outer band, tray and cap — and where the heat is being slowed at each layer.
Safety
What you'll need
- Baking parchment
- Brown paper or newspaper, and string
- A baking tray
- Kitchen foil
Step by step
- Double-line the tin, base and sides.Two thicknesses of parchment, not one. Cut the side strips long enough to overlap and tall enough to stand five to seven centimetres above the rim — that standing collar shields the top edge of the cake as it rises and takes the direct heat instead of the crust.
- Wrap the outside with a paper band.A double thickness of brown paper or several sheets of folded newspaper round the circumference, standing slightly taller than the tin, tied with string. This is the piece that does the most work: it slows heat reaching the side of the tin, which is where the cake burns first.
- Stand the tin on a baking tray, on a low shelf.The tray slows base heat. A low shelf in a conventional oven keeps the cake away from the hottest zone at the top. Some bakers put a folded sheet of newspaper on the tray underneath as well.
- Bake low.Rich fruit cakes are baked at around 140–150°C conventional, sometimes lower for very large ones, which is far cooler than a sponge. If your recipe says 160°C and your cake darkens, your oven is probably running hot — check it.
- Cap the top with foil once it has taken colour.Lay a sheet loosely across the top of the collar, shiny side up, without sealing it down. The gap lets steam escape; a sealed foil lid steams the crust and makes the top wet. Do this after the top has browned, typically an hour or more in — not from the start, or the cake will not colour at all.
- Test with a skewer, but read the shrinkage too.Fruit will wet a skewer no matter how baked the cake is, so also look for the cake pulling very slightly from the tin and the top feeling firm with no wobble. A probe thermometer in the centre reading around 95°C is the most reliable single test.
- Cool in the tin, completely.Hours. A hot fruit cake is fragile and turning it out warm breaks it. Once cold, wrap it in parchment then foil for maturing — see `make-christmas-baking-ahead`.
Tips
- The paper band is easier to fit before the batter goes in. Tie it round the empty tin, then line, then fill.
- Soaked fruit that goes in wet both weighs the batter down and lengthens the bake. Drain it and let it sit in a sieve for half an hour.
- Very large cakes — 25cm and up — often need a lower temperature again and a bake measured in hours. Judge by the probe temperature, not by a time from a recipe written for a smaller tin.
- Keep the oven closed for the first two-thirds. Every door opening on a four-hour bake costs real time and can drop the middle.
Common mistakes
- Baking a fruit cake at sponge temperature — At 180°C a deep fruit cake will be black at the edge and liquid in the middle. The whole method depends on a low oven and a long time.
- Covering with foil from the start — The cake never develops colour or crust and the top ends up pale and damp. Cap late, not early.
If it doesn't work
Sides dark and hard, middle still raw at the stated time
Cause: No outer insulation, or the oven running hot. — Fix: Add the paper band and drop the temperature by 10–20°C. Extend the time rather than raising the heat.
Top burnt, sides fine
Cause: Too high a shelf, or no collar and no foil cap. — Fix: Lower the shelf, extend the parchment above the rim, and cap with loose foil once coloured.
Base dark and dry
Cause: Direct base heat, common in ovens with a bottom element and in thin tins. — Fix: Stand the tin on a baking tray, and consider a sheet of folded paper on the tray under it.
Top wet and pale after capping with foil
Cause: The foil was sealed down, trapping steam against the crust, or it went on too early. — Fix: Lay it loose with a gap at the sides, and only after the top has browned.
Cake sunk in the middle after a very long bake
Cause: Usually too much liquid — a heavy soak on the fruit that was not drained, or too much alcohol added to the batter. — Fix: Drain soaked fruit thoroughly. Feed the cake with spirits after baking, not before.
Questions people ask
Is newspaper round a tin actually safe in an oven?
At fruit-cake temperatures — 140–150°C — yes, and it has been standard practice for a very long time. Paper does not ignite until well above that. Keep it away from the elements and the oven roof, do not use it in a fan oven where it can be blown about, and use brown paper if you would rather not have newsprint near food.
Can I use a slow cooker instead?
You can, and it solves the burning problem completely because nothing gets near a browning temperature. The trade-off is no crust and a steamed rather than baked character. It suits a cake that is going to be marzipanned and iced anyway.