Blind baking is needed whenever the filling will not survive the same treatment as the pastry: cold curd, ganache, fresh berries. The job is to bring the shell to full doneness separately while keeping the walls vertical and the base flat. Two forces work against you: steam, which lifts the base, and gluten, which pulls the walls inward.
Weights or perforation
Two approaches solve the same problem differently, and the choice is not a matter of taste.
Weights — parchment laid into the shell with a filling on top: ceramic beans, rice, dried pulses. The weight physically holds the base down and props up the walls.
Its weakness is that the parchment stops the surface drying: moisture stays underneath, and once the weights come off the pastry looks pale and damp — a second stage is needed.
A perforated ring on a perforated mat works differently: steam escapes freely through the holes, the base does not dome, and the wall holds because the pastry clings to the sides of the ring. No weights required.
The practical conclusion: with a perforated set, weights are redundant; with a solid ring they are compulsory. The middle option — solid ring plus weights — works but takes two stages and gives a less even wall.
What to use as weights
Ceramic beans are the most convenient: heavy, evenly distributed, and they last for years.
Rice and dried beans work but are markedly lighter — they need to be poured right to the top of the wall, or the upper part of it has no support and slumps. This is the commonest mistake: the weights are filled to a third of the height, and exactly the part above them sinks.
Lay the parchment in crumpled rather than smooth: crumpled paper follows the shape better and leaves no creases printed into the pastry.
The temperature
Blind baking runs in two stages, and their temperatures differ.
| Stage | Temperature | Time | What happens |
|---|---|---|---|
| With weights | 170 °C | 15–18 min | The pastry sets and fixes its shape |
| Without weights | 160 °C | 8–12 min | The base dries out, the wall takes colour |
For sweet sucrée and sablée, drop the first temperature by 10 °C: the sugar darkens noticeably earlier.
The oven must be fully up to heat. A shell put into an under-heated oven loses its shape before the pastry can set — the butter melts before the proteins coagulate.
When to lift the weights
Judge by appearance rather than the clock: the wall should have gone matte and hold its own shape, having lost its damp sheen. That is usually 15 to 18 minutes.
Lift them early and the wall slumps — the pastry is still plastic. Lift them late and you get a pale damp base that can no longer be dried without over-baking the edges.
Check gently: lift the parchment by its corners and look at the wall. If it has stayed vertical, the weights can come out.
Why the wall comes out thick
A common complaint, and the cause is usually in the lining rather than the baking.
Pastry pressed into the ring with fingers piles up surplus in the corner between base and wall. During baking that surplus darkens and toughens, and the wall itself looks heavy.
The right move: lay the pastry in loosely, without tension, press it into the base, then form a right angle with a small offcut of the same dough or the back of a spoon, and only after that press it to the side. Trim the surplus above the rim with a knife, cutting from outside inward, after chilling — a warm dough drags and tears under the blade.
Rolling thickness for a tart is 2.5 to 3 mm. That is noticeably thinner than it looks right by eye, which is exactly why you roll on guides.
How to tell the shell is done
- The base is an even golden colour across its whole area, with no pale patch in the centre.
- The wall is a shade or two darker than the base, the rim slightly browner still.
- The shell comes away from the ring freely and does not flex when lifted.
- The base is dry to the touch and sounds crisp when tapped.
A pale patch in the middle of the base means the second stage was too short. That shell will go soft under its filling within hours — which is its own subject, covered in the piece on sealing a tart base.
The full cycle from pastry to assembly is shown in the masterclasses Lemon Tartlet and Tart with Fresh Berries.