Soggy pastry base

The causes, most likely first

• The case was not blind-baked far enough. Pale pastry is undercooked pastry. It should be genuinely golden and sandy before any filling touches it.
• No seal. A hot blind-baked case brushed with beaten egg and returned to the oven for two minutes gets a thin waterproof film. This step takes no time and does more than anything else.
• A ceramic or glass dish. They insulate. A metal tin conducts heat into the base and gives a far crisper result.
• The oven shelf was too high. Bake on a low shelf, or on a preheated baking tray or pizza stone, so heat reaches the base directly.
• A wet filling. Vegetables that were not cooked and drained, fruit that was not macerated and drained, a custard that was too loose.
• Assembled too far ahead. Time is the enemy. A filled raw case sitting for an hour is already losing.

Blind baking properly

1. Line the tin with pastry, prick the base lightly, and chill it for at least 30 minutes. Cold pastry shrinks less.
2. Line with baking parchment — scrunched first so it sits into the corners — and fill right to the top with baking beans, rice or dried pulses. Filling it fully supports the sides.
3. Bake at 190–200°C for around 15 minutes, until the sides are set and dry to the touch.
4. Lift out the parchment and beans and return the case to the oven for a further 10–15 minutes, until the base is golden and looks sandy rather than damp.
5. Brush the hot base with beaten egg and return it for two minutes to set the seal.
6. Fill while the case is still warm if the filling is going straight back into the oven.

Barriers that work

Egg wash

The best all-purpose seal. Cooks into a thin film.

Melted chocolate

For sweet tarts. Brush a thin layer over the cooled base and let it set. Completely waterproof and tastes good.

Ground almonds or semolina

A tablespoon scattered on the base absorbs juice before it reaches the pastry. Good for fruit tarts.

Breadcrumbs

The savoury equivalent, and traditional in continental fruit pies.

A layer of cheese

In a quiche, a scattering of hard cheese on the base melts into a partial barrier.

Jam, thinly brushed

Sets to a seal and adds flavour under a fruit tart.

Why the tin matters more than people expect

Pastry crisps when heat reaches it fast enough to drive water off the surface before the filling can soak in. How quickly that happens depends largely on what the pastry is sitting on.

Metal conducts heat quickly and gets the base up to temperature within a few minutes. Ceramic and glass are insulators: they take a long time to warm through, and while they are warming the base of the tart is sitting somewhere between cool and tepid, absorbing filling.

A thin, dark metal tin with a loose base is the best domestic option, and putting it onto a preheated baking sheet or a pizza stone improves it further. Attractive ceramic tart dishes are the single most common reason a carefully blind-baked case still ends up soft underneath.

Common questions