Shredded Suet, Against Butter

Suet and What Its Melting Point Actually Does

Suet — the hard white fat surrounding beef or lamb kidneys — melts at a significantly higher temperature than butter. Butter begins to soften around 28–34 °C and is fully liquid well before a steaming pudding reaches its internal cooking temperature. Suet holds its structure far longer into the cooking process, and that delay is the point. The fat particles remain solid while the batter sets around them, then release their grease late, creating a crumb that is simultaneously light and slightly open — the characteristic texture of a steamed suet pudding or a cloth-boiled roly-poly. Butter, melting earlier, tends to integrate more completely, producing a finer, denser, more cake-like crumb.

Beef suet sold for baking is pre-shredded and coated lightly in flour to prevent clumping. The coating also helps it distribute evenly through the mixture without needing to be rubbed in. This is a convenience rather than a necessity: raw suet taken directly from a butcher and grated at home behaves identically in the finished pudding, but shredded commercial suet is more consistent in particle size, which matters for even distribution. The fat surrounding the kidneys is harder than the fat found elsewhere on the carcase, and that hardness — that high melting point — is precisely what the recipe is designed around.

Vegetable suet, produced by hydrogenating vegetable oils to approximate the same melting point and crumb, performs adequately in most steamed puddings. It is not suet in any taxonomic sense. The texture of the finished pudding is slightly more uniform — it lacks the faint greasiness that beef suet can leave on the palate, which some cooks prefer and others do not. For a Christmas pudding, the difference matters less than in a suet pastry casing, where the open, layered quality of real beef suet is more legible in the result. In a batter full of dried vine fruit, dark muscovado and black treacle, the fat's contribution to texture is largely masked by everything else. In a plain suet pastry, the masking disappears.

When Butter Is the Right Call

Butter is not the wrong fat — it is fat for a different job. Where a pudding depends on a sponge-like rise and a uniform, tight crumb, butter is superior. A steamed treacle sponge is technically a pudding but behaves more like a cake inside its basin: it wants the fine, even texture that comes from creaming butter and sugar together, building air into the batter before a gram of liquid is added. Suet cannot be creamed. It does not trap air. A suet batter mixed to the same consistency as a butter batter would produce a dense, flat result.

Sticky toffee pudding follows the same logic: the sponge is built on a creamed butter base, and the toffee sauce that defines the dish is an emulsion of butter, cream and sugar. Substituting suet into either component would change the pudding into something altogether different. The richness of butter — its milk solids, its emulsifying capacity, its flavour — is what the recipe requires.

The boundary, then, is fairly clear. Pastry-based puddings, boiled or steamed in a cloth or basin, use suet for its structural behaviour at temperature and its late-releasing fat. Sponge-based puddings, even when steamed in a basin, generally use butter for aeration and flavour integration. Bread-and-butter pudding is, as its name states, a butter pudding — the fat is absorbed into the bread before cooking, and no amount of suet would replicate what butter does there.

One honest qualification: the line blurs in a Christmas pudding, which uses neither creamed butter nor suet-pastry technique. It is a dense, pressed batter with no requirement for aeration. Either fat will work. Beef suet is the historical and canonical choice, and it gives a slightly more open crumb than a butter version. Both produce a pudding worth eight hours of steaming. Neither produces the other's result.