Raspberry Cream Pie Day

What the day is

Raspberry Cream Pie Day is observed on August 1. The pie is a cold one: a baked or crumb shell filled with sweetened cream, cream cheese or custard, layered or folded with fresh raspberries and chilled until it slices.

The timing is right for once. Early August is peak raspberry season across much of the northern hemisphere, which matters more for this fruit than most.

Origin and background

The origin of the observance is not documented.

The raspberry's structure explains its behavior. It is an aggregate fruit, a cluster of small drupelets each with its own skin and seed, held together around a central core. When picked, the fruit separates from that core and leaves it on the plant, which is why a raspberry is hollow and a blackberry is not.

That hollow structure also makes it extraordinarily fragile. There is very little flesh holding the drupelets together, the skin is thin, and the fruit bruises under its own weight in the punnet. Raspberries mold faster than almost any other soft fruit, which is why they are expensive out of season and why a box bought on Monday is often unusable by Wednesday.

For a cream pie this matters practically. Cooked raspberry breaks down into seeds and liquid very quickly, so most good versions keep the fruit raw and cold, using the cream layer as the structure and the berries as the top or a folded ribbon.

How to take part

• Buy raspberries the day you need them and check the bottom of the punnet, where spoilage starts.
• Do not wash them until just before use, and dry them gently. Wet berries weep into the filling.
• Keep most of the fruit raw. If you want a cooked element, make a small reduced coulis and swirl it rather than cooking the whole quantity.
• Chill the pie thoroughly, at least four hours, so the cream sets enough to cut cleanly.
• Add the top layer of berries shortly before serving, so they still look like fruit rather than collapsing into the cream.
• Frozen raspberries work in a cooked or blended element but not as the fresh topping.