Borstplaat is a Dutch fondant confection, made from sugar, full-fat milk or cream, and butter, cooked together to a specific temperature, beaten until the mass crystallises uniformly, and poured immediately into shallow discs to set. The name borstplaat — literally "chest plate" — is conventionally explained as a reference to the medallion-like shape of the discs, which resemble the rondelle pendants once worn on military uniforms. The etymology is widely repeated and probably correct, though earlier folk explanations involving Saint Nicholas's protective breastplate appear in some folklore literature and should be treated with the usual caution.

Within the Sinterklaas confectionery calendar, borstplaat occupies a particular slot: it is the most domestic of the principal sweets, the one most often produced at home rather than purchased, and the one with the simplest recipe. A Dutch household with no baking aspiration can produce a respectable borstplaat from sugar, full milk, and a few flavourings in under twenty minutes; the technique has been passed down in family kitchens for generations and is one of the small Dutch culinary skills that is often acquired in childhood by direct observation rather than from a written recipe.

The technique

The basic borstplaat technique is straightforward. Sugar and full-fat milk (in approximately a 4:1 ratio by weight) are combined in a heavy saucepan, brought to the boil, and cooked, with constant stirring, to roughly 116°C (the soft-ball stage on a sugar thermometer). At this temperature the syrup is removed from the heat, butter and flavouring are added, and the mass is beaten vigorously with a wooden spoon for two or three minutes until it loses its gloss and begins to crystallise. The crystallising mass is then poured immediately into prepared rings or moulds — historically small metal rings on a baking sheet, in modern domestic practice often silicone moulds — where it sets within five minutes into firm, opaque, sugary discs.

The technique is the same as for French fondant or American panocha, with the Dutch distinction lying in the temperature (slightly lower than American fudge, producing a drier and less creamy texture), the ratio of milk to sugar (lower-milk than fudge, more sugar), and the absence of corn syrup or glucose (which most American fudge recipes use to inhibit excessive crystallisation). The result is a very sweet, dense, fine-grained sugar candy with a clean snap in the mouth — quite different from the chewy fudge that occupies the analogous slot in Anglo-American confectionery.

The flavours

The classical borstplaat flavours are four:

  • Vanille — vanilla, the default flavour, traditionally with vanilla sugar or vanilla extract added at the butter stage. The product is white-cream coloured.
  • Chocolade — chocolate, made by adding cocoa powder or melted chocolate at the butter stage. The product is mid-brown.
  • Koffie — coffee, made by replacing some of the milk with very strong espresso. The product is pale brown.
  • Citroen — lemon, made by adding lemon zest and juice at the butter stage. The product is pale yellow.

A typical Sinterklaas-week borstplaat presentation in a Dutch household will include all four flavours arranged on a single plate, the discs colour-coded so that the eater knows which flavour is which without having to ask. Industrial commercial borstplaat — sold by some confectioners during the Sinterklaas season — typically expands the palette to include strawberry, raspberry, and occasionally licorice, but the classical four remain dominant in domestic production.

The disc form

The standard borstplaat disc is approximately 40–60mm in diameter and 8–10mm thick. Larger discs (up to 100mm) and smaller ones (down to 25mm) are also produced, but the medium size is the conventional one. Historically, the discs were poured into small metal rings — sliced sections of metal pipe — placed on a flour-dusted baking sheet, with the rings removed once the candy had set. Modern domestic production uses silicone moulds with ring-shaped cavities, which have largely replaced the older technique.

The disc shape is functional rather than purely decorative. Borstplaat sets quickly and unevenly, and the disc form ensures uniform thickness across each piece, which in turn ensures that the candy crystallises evenly throughout. A poured slab of borstplaat would set unevenly, with the centre remaining slightly tackier than the edges. The disc form solves this problem and is one of the small technical observations that has been built into the tradition.

Why borstplaat does not store

Borstplaat does not keep well. Once made, the candy is at its best within 48 hours and is noticeably degraded after a week. The principal failure mode is moisture absorption: the high sugar content makes the discs hygroscopic, and at typical Dutch domestic humidity they will absorb water from the air and become tacky on the surface within several days. The interior crystallisation also coarsens over time, with the fine sugar grains migrating into larger crystals that produce a grittier texture.

This is why borstplaat is the most domestic of the Sinterklaas confections. The candy is fundamentally unsuited to mass production and supermarket distribution; the few commercial borstplaats sold in Dutch supermarkets in late November are typically stabilised with glucose syrup or invert sugar to extend shelf life, with predictable consequences for texture. The proper way to encounter borstplaat is to make it (or to receive it from someone who has made it) in the days immediately before the feast, and to eat it within the week.

As a household ritual

The making of borstplaat is, in many Dutch households, a child-and-parent activity. The technique is simple enough to be learned by a six- or seven-year-old under supervision, the equipment required is minimal, and the result is a substantial confectionery output from a relatively short kitchen session. The activity has, accordingly, become a Sinterklaas-week ritual in households that observe it: the child stirs the pan, the parent supervises the temperature, and the resulting discs are presented at the family meal on the eve of the feast.

This ritual is one of the few elements of the Sinterklaas confectionery calendar that has resisted the supermarket. The kruidnoten can be bought, the chocolade letters arrive from the school, the marsepein figures are purchased from the bakery — but the borstplaat is, in many households, still made at home, and the act of making it is, more than the result, what carries the meaning. The candy itself is honestly nothing remarkable: very sweet, mildly flavoured, and easily replicable. The remembered childhood Sinterklaas in many Dutch households is, in part, the remembered domestic kitchen with a parent stirring sugar and milk on the stove.