Rhubarb is best made into a crumble. Only the stalks are edible - the leaves are very poisonous indeed.
Custard is made from milk, eggs, cornflour, sugar and vanilla, and goes in trifles.
Grange Calveley was inspired to create Roobarb by his Welsh Border Collie dog.
The colouring-in on the Roobarb cartoons was done with Magic Markers.
The wobbling animation effect in the Roobarb cartoons is known as boiling.
Narrator Richard Briers came up with twenty-four voices over Roobarb's thirty episodes.
Narrator Richard Briers based the voice of a witty crow in the series on Noel Coward.
In one story, the effect of Roobarb speaking from within a suit of armour was created by Richard Briers reading with a waste-paper bin over his head.
Narrator Richard Briers is the cousin of fifties comedy cad Terry-Thomas.
When Roobarb Made A Spike was chosen by the International Exhibition of Animated Films, Rome as one of the best animated films of 1972-3.
Within three weeks of its first broadcast, Roobarb was attracting audiences of over seven million people.
After Roobarb, Grange Calveley went on to write bonkers two-headed animal romp Noah and Nelly on the Skylark, often remembered for its catchphrase, "All aboard the Skylark!"
Roobarb animator Bob Godfrey went on to a second success with Henry's Cat, a cartoon about a laid-back, chilled out cat. It was apparently very popular with students.
As well as narrating Roobarb, Richard Briers is particularly well known for playing Tom Good in comedy series The Good Life
Roobarb's a pop star, having reached number three in the UK charts.
Roobarb and Custard were the presenters for the BBC's I Love 1974 programme.
Roobarb themed merchandise has included Marks and Spencer sheets printed with bones and Roobarb slippers from Woolworths.
