Butter Is Not Just an Ingredient — It Is the Foundation
In French pâtisserie, butter is rarely just a flavouring agent. It is structural. It creates layers in croissants, tenderness in financiers, richness in crème pâtissière, and snap in shortcrust pastry. The quality, fat content, and water percentage of your butter will directly and measurably affect every bake. Understanding butter is therefore one of the most valuable things a home baker can learn.
Fat Content: Why It Matters
Standard European butters typically contain between 80% and 84% butterfat. French butters, particularly premium ones labelled beurre de qualité supérieure, often reach 84%. In contrast, some commodity butters sold elsewhere can contain as little as 78–80% fat, making up the difference with water.
That extra water is a problem in pastry for two reasons:
- It makes laminated doughs (croissants, puff pastry) harder to work with, as the butter becomes softer and more likely to seep into the dough rather than stay as distinct layers.
- It adds steam during baking, which can make pastry cases soggy and tart shells soft rather than crisp.
For everyday sponges and cookies, a standard good-quality unsalted butter is perfectly adequate. For lamination, always seek out a higher-fat option.
Beurre de Tourage: The Lamination Specialist
Professional pâtissiers use a specialised product called beurre de tourage (also called dry butter or sheet butter) for lamination. It has a fat content of around 84% and is formulated to remain pliable across a wider temperature range than regular butter — meaning it bends rather than cracks when cold, and holds its shape rather than smearing when slightly warm.
While not always easy to find in supermarkets, some specialist baking retailers and online suppliers stock it. If unavailable, the next best option is a quality French-style cultured butter with at least 82% fat.
Cultured vs. Sweet Cream Butter
| Type | Production Method | Flavour | Best Used For |
|---|---|---|---|
| Sweet Cream Butter | Fresh cream churned directly | Mild, clean, milky | General baking, buttercreams |
| Cultured (Lactic) Butter | Cream fermented before churning | Complex, slightly tangy, nutty | Croissants, tarts, brioches |
Cultured butter, the traditional style in France, adds a depth of flavour that truly elevates viennoiserie. Brands widely available in many countries — including Isigny Sainte-Mère, Échiré, and various own-brand French-style options — make excellent choices.
Salted vs. Unsalted
Always use unsalted butter in French pastry unless a recipe specifically calls for salted. Salt affects gluten development, yeast activity, and flavour balance in ways that are difficult to control when the salt is already in your butter. Add salt separately so you remain in control of the quantity.
The notable exception is beurre salé (salted butter) from Brittany, used intentionally in certain Breton recipes like galettes and kouign-amann, where the salt is a defining characteristic of the final flavour.
Storage and Freshness
Butter absorbs odours readily. Store it wrapped well or in an airtight container, away from strong-smelling foods. For croissants and delicate pastries, use the freshest butter you can find — rancid notes in butter become amplified during baking and will define the final result.