Decorating Gingerbread Biscuits with Royal Icing

Why royal icing is worth the faff

Gingerbread biscuits are forgiving. The dough is sturdy, the spices are generous, and even a slightly wonky star tastes wonderful with a cup of tea. Royal icing, on the other hand, has a reputation for being fiddly — and it is, a little, but the rewards are enormous. It dries to a glossy, snow-white finish that holds its shape, takes colour beautifully, and turns a tray of plain biscuits into something you would happily hand over as a gift.

The trick is understanding that royal icing is not one thing. It is a single mixture used at two different consistencies: one for drawing outlines, one for filling them in. Once you have both under control, the rest is patient, pleasant work at the kitchen table with a piping bag and a plate of biscuits.

Making royal icing that behaves

You need very little: icing sugar, egg white, and a drop of lemon juice. For a batch large enough to decorate around twenty medium biscuits, sift 250g icing sugar into a bowl, add one egg white (use a pasteurised one from a carton if you would rather avoid raw egg) and half a teaspoon of lemon juice. Beat with an electric hand mixer on low for a minute, then on high for four or five, until the mixture is thick, glossy and stands in firm peaks.

• Sift the sugar twice if you have time — lumps will clog even a wide nozzle.
• Add half a teaspoon of glycerine if you want a softer bite; without it the icing sets glass-hard.
• Colour with gel or paste, never liquid food colouring, which loosens the icing and dulls the shade.
• Keep the bowl covered with cling film pressed onto the surface; royal icing skins over within minutes.

Piping versus flooding: the fifteen-second test

Split your icing between bowls before you colour it. One portion stays stiff for outlining — it should hold a sharp peak and feel like thick toothpaste. Loosen the other portion, a spoonful of water at a time, until it reaches flooding consistency.

The reliable test is this: lift a spoonful and let it fall back into the bowl. Count how long the ribbon takes to disappear into the surface. Around fifteen seconds is right for flooding; if it vanishes instantly it is too thin, and if it sits proudly on top for half a minute it is too thick. Aim for the icing to spread level on its own within a few seconds, without running off the edge of the biscuit.

Outlining and flooding, step by step

Fit a piping bag with a 1.5mm plain nozzle for outlines — a size 1 or 1.5 writing tip is ideal. Hold the bag at a slight angle, tip just above the surface, and trace the edge of the biscuit in a smooth, unbroken line. Do not worry about perfection; the flood will hide small wobbles. Let the outline set for ten to fifteen minutes until it feels dry to a light touch. This dam is what stops the flood escaping.

Switch to a clean bag with a slightly wider nozzle, or simply snip the end, and fill the outline. Work in small spirals from the edge inwards, or squeeze a generous blob in the centre and tease it out with a cocktail stick. Then lift the tray an inch above the worktop and drop it gently — a couple of firm taps settles the icing and pops any bubbles.

• Flood within thirty minutes of outlining so the two layers fuse into one smooth surface.
• Use a cocktail stick to nudge icing into corners and to burst bubbles straight away.
• If you are adding a second colour, wait until the first is completely dry before you start.

Details, patterns and a few quiet tricks

Once the base is dry, the fun begins. A slightly thicker icing is best for detail work: dots for buttons on a gingerbread man, a scalloped hem on a bauble, tiny holly leaves on a star. Pipe dots by holding the bag still and squeezing, then stopping with a quick flick of the wrist.

For a marbled effect, pipe two or three dots of a contrasting colour onto wet flood icing and drag a cocktail stick through them in curves. For a sugared look, sprinkle caster sugar or edible glitter over wet icing and tip the excess back into the pot — never sprinkle over a bowl of your good decorations, or you will end up with a sticky mess.

Drying, storing and giving them away

Dry your biscuits uncovered at room temperature for at least six hours, ideally overnight. A cool, dry room is perfect; a fridge is not, as the humidity will leave the icing tacky and prone to smudging. Once fully set, they will keep for two to three weeks in an airtight tin, layered between sheets of baking parchment.

For gifting, stack three or four biscuits in a cellophane bag, tie with ribbon and add a handwritten tag. Undecorated gingerbread freezes beautifully for up to three months, so you can bake a big batch in November and decorate in small, calm sessions through December. There is something deeply satisfying about a tin of neat, hand-piped biscuits — and the person receiving them will notice the effort far more than any small imperfection.